{"title":"Dampers","description":"\u003cstyle\u003e\n\/* Neutralise the theme's height-based clamp on the collection description and hide\n   its toggle. Visibility is controlled by the \u003cdetails\u003e below instead, mirroring the\n   PDP's pdp-summary-more pattern: the author decides where the summary ends, so there\n   is no measuring, no fade, and nothing gets cut mid-sentence at any viewport. *\/\n.collection__description.expandable-content{max-height:none!important;padding-bottom:0!important}\n.collection__description .expandable-content__toggle{display:none!important}\n\n#efans-subnav{display:flex;flex-wrap:nowrap;gap:10px;margin:52px 0 4px;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:#d8d8d8 transparent;padding:4px 0 8px;scroll-snap-type:x proximity}\n#efans-subnav \u003e a{flex:0 0 auto;white-space:nowrap;scroll-snap-align:start;padding-left:16px;padding-right:16px}\n#efans-subnav::-webkit-scrollbar{height:6px}\n#efans-subnav::-webkit-scrollbar-thumb{background:#d8d8d8;border-radius:3px}\n#efans-subnav::-webkit-scrollbar-track{background:transparent}\n\n.efx-more{margin-top:28px}\n.efx-more \u003e summary{list-style:none;cursor:pointer;display:inline-block;color:var(--text-color);text-decoration:underline;text-decoration-style:dotted;text-underline-offset:3px}\n.efx-more \u003e summary::-webkit-details-marker{display:none}\n.efx-more \u003e summary:hover{color:var(--heading-color)}\n.efx-more .efx-more__open{display:none}\n.efx-more[open] \u003e summary .efx-more__closed{display:none}\n.efx-more[open] \u003e summary .efx-more__open{display:inline}\n.efx-more__content{margin-top:24px}\n.efx-more__content h2:first-child{margin-top:0}\n\u003c\/style\u003e\n\n\u003cp\u003eDampers regulate, balance or stop airflow inside ventilation ductwork. This is our full range, grouped by the job it does: fire dampers and intumescent fire blocks for fire compartment protection, volume control dampers for balancing a system, and back draught dampers to stop air, fumes or noise travelling back the wrong way. Sizes run from 100mm to 600mm, and most items are in stock with next day delivery on trade accounts. Fire protection is the one area where getting the specification wrong has consequences beyond performance, so if a damper is crossing a fire-rated element, send us the drawings and the rating of the wall or floor and we will spec it against them. Call \u003ca href=\"tel:01613993825\"\u003e0161 399 3825\u003c\/a\u003e or email \u003ca href=\"mailto:hello@efans.co.uk\"\u003ehello@efans.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdetails class=\"efx-more\"\u003e\n\u003csummary\u003e\u003cspan class=\"efx-more__closed\"\u003eRead more\u003c\/span\u003e\u003cspan class=\"efx-more__open\"\u003eRead less\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"efx-more__content\"\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat types of damper are there?\u003c\/h3\u003e\n\u003cp\u003eFour common types. \u003ca href=\"\/collections\/fire-dampers\"\u003eFire dampers\u003c\/a\u003e close to stop fire and smoke crossing a compartment line. \u003ca href=\"\/collections\/intumescent-fire-blocks\"\u003eIntumescent fire blocks\u003c\/a\u003e are passive cartridges that expand and seal an air transfer opening when heated. \u003ca href=\"\/collections\/volume-control-dampers\"\u003eVolume control dampers\u003c\/a\u003e set and balance airflow in a branch. \u003ca href=\"\/collections\/non-return-dampers\"\u003eBack draught or non-return dampers\u003c\/a\u003e let air out but close against reverse flow. A single combination unit can provide both fire protection and volume control.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I choose the right damper?\u003c\/h3\u003e\n\u003cp\u003eStart with the job. If a duct or grille passes through a fire-rated wall or floor you need a fire damper or intumescent fire block matched to the rating of that element. If you are balancing flow between branches you need a volume control damper. If you are stopping cold air, smells or noise returning through an outlet you need a back draught damper. Match the size to the duct diameter, and call us if a single run needs more than one type.\u003c\/p\u003e\n\n\u003ch3\u003eDo all dampers provide fire protection?\u003c\/h3\u003e\n\u003cp\u003eNo, and this is the most important distinction on the page. Only fire dampers and intumescent fire blocks are rated to hold back fire and smoke, and they carry a classification stating how long they last. Volume control and back draught dampers manage airflow only and have no fire rating whatsoever, so they must never be used in place of a fire damper where the Building Regulations require one, however similar they look once installed.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does an EI rating mean?\u003c\/h3\u003e\n\u003cp\u003eEI is the European fire classification used for fire dampers. E stands for integrity, meaning the damper stops flame and hot gases passing through. I stands for insulation, meaning it also limits heat transfer to the unexposed side. The number is the performance in minutes, so EI 120 means both criteria are met for 120 minutes. The damper rating should match the fire resistance of the wall or floor it penetrates, which is why the drawings matter more than the duct size when specifying.\u003c\/p\u003e\n\n\u003ch3\u003eHow does a fire damper close?\u003c\/h3\u003e\n\u003cp\u003eTwo common mechanisms. A mechanical fire damper is held open by a thermal release, usually a fusible link that melts at a set temperature and lets a spring-loaded curtain or blade drop shut. A motorised fire damper is held open by an actuator and driven closed on a signal, typically from the fire alarm or a smoke detector, which allows remote testing and monitoring. Check which type the specification calls for, since a mechanical damper responds only to heat at the damper itself, not to smoke detected elsewhere in the building.\u003c\/p\u003e\n\n\u003ch3\u003eDo fire dampers need access for inspection?\u003c\/h3\u003e\n\u003cp\u003eYes. Fire dampers are life safety devices and require periodic inspection and testing, so every damper needs an access panel large enough to reach the mechanism and reset it. This is routinely overlooked at first fix and then very expensive to correct once ceilings are closed. Plan access panel positions at the same time as the damper positions, and keep a record of where each damper is, because an undocumented damper does not get tested.\u003c\/p\u003e\n\n\u003ch3\u003eWhere should a volume control damper be fitted?\u003c\/h3\u003e\n\u003cp\u003eIn the branch it is controlling, far enough from the terminal that the turbulence it creates has settled before the air reaches the grille, and somewhere a person can actually reach to adjust it. A damper throttled down hard is a sign the branch is oversized rather than a solution in itself, and it will generate noise at the blade. Leave it accessible, because the system will need rebalancing after any change.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does a back draught damper do?\u003c\/h3\u003e\n\u003cp\u003eIt lets air pass in one direction and closes against flow in the other, using either gravity-hung blades or a light spring. It stops cold air, smells and noise coming back through an extract outlet when the fan is off, and on shared or multi-outlet systems it stops one extract point discharging into another. On any run that terminates externally without a self-closing grille, it is what keeps wind from pushing straight back down the duct.\u003c\/p\u003e\n\n\u003ch3\u003eDo you supply dampers for trade and project work?\u003c\/h3\u003e\n\u003cp\u003eYes. We supply M\u0026amp;E contractors, installers, developers and facilities teams, and hold stock from 100mm to 600mm for next day delivery. Send the drawings, the fire strategy or a damper schedule and we will price it, confirm ratings against the compartment lines, and flag anywhere access looks like it has not been allowed for. Call \u003ca href=\"tel:01613993825\"\u003e0161 399 3825\u003c\/a\u003e or email \u003ca href=\"mailto:hello@efans.co.uk\"\u003ehello@efans.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdiv id=\"efans-subnav\"\u003e\n\u003ca class=\"button button--ternary\" href=\"\/collections\/fire-dampers\"\u003eFire Dampers\u003c\/a\u003e\n\u003ca class=\"button button--ternary\" href=\"\/collections\/intumescent-fire-blocks\"\u003eIntumescent Fire Blocks\u003c\/a\u003e\n\u003ca class=\"button button--ternary\" href=\"\/collections\/volume-control-dampers\"\u003eVolume Control Dampers\u003c\/a\u003e\n\u003ca class=\"button button--ternary\" href=\"\/collections\/non-return-dampers\"\u003eBack Draught Dampers\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"What types of damper are there?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Four common types. Fire dampers close to stop fire and smoke crossing a compartment line. Intumescent fire blocks are passive cartridges that expand and seal an air transfer opening when heated. Volume control dampers set and balance airflow in a branch. Back draught or non-return dampers let air out but close against reverse flow. A single combination unit can provide both fire protection and volume control.\"}},\n    {\"@type\":\"Question\",\"name\":\"How do I choose the right damper?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Start with the job. If a duct or grille passes through a fire-rated wall or floor you need a fire damper or intumescent fire block matched to the rating of that element. If you are balancing flow between branches you need a volume control damper. If you are stopping cold air, smells or noise returning through an outlet you need a back draught damper. Match the size to the duct diameter.\"}},\n    {\"@type\":\"Question\",\"name\":\"Do all dampers provide fire protection?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Only fire dampers and intumescent fire blocks are rated to hold back fire and smoke, and they carry a classification stating how long they last. Volume control and back draught dampers manage airflow only and have no fire rating whatsoever, so they must never be used in place of a fire damper where the Building Regulations require one, however similar they look once installed.\"}},\n    {\"@type\":\"Question\",\"name\":\"What does an EI rating mean on a fire damper?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"EI is the European fire classification used for fire dampers. E stands for integrity, meaning the damper stops flame and hot gases passing through. I stands for insulation, meaning it also limits heat transfer to the unexposed side. The number is the performance in minutes, so EI 120 means both criteria are met for 120 minutes. The damper rating should match the fire resistance of the wall or floor it penetrates.\"}},\n    {\"@type\":\"Question\",\"name\":\"How does a fire damper close?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Two common mechanisms. A mechanical fire damper is held open by a thermal release, usually a fusible link that melts at a set temperature and lets a spring-loaded curtain or blade drop shut. A motorised fire damper is held open by an actuator and driven closed on a signal, typically from the fire alarm or a smoke detector, which allows remote testing and monitoring. A mechanical damper responds only to heat at the damper itself, not to smoke detected elsewhere.\"}},\n    {\"@type\":\"Question\",\"name\":\"Do fire dampers need access for inspection?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Fire dampers are life safety devices and require periodic inspection and testing, so every damper needs an access panel large enough to reach the mechanism and reset it. This is routinely overlooked at first fix and expensive to correct once ceilings are closed. Plan access panel positions alongside damper positions, and keep a record of where each damper is, because an undocumented damper does not get tested.\"}},\n    {\"@type\":\"Question\",\"name\":\"Where should a volume control damper be fitted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In the branch it is controlling, far enough from the terminal that the turbulence it creates has settled before the air reaches the grille, and somewhere a person can actually reach to adjust it. A damper throttled down hard is a sign the branch is oversized rather than a solution in itself, and it will generate noise at the blade. Leave it accessible, because the system will need rebalancing after any change.\"}},\n    {\"@type\":\"Question\",\"name\":\"What does a back draught damper do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It lets air pass in one direction and closes against flow in the other, using either gravity-hung blades or a light spring. It stops cold air, smells and noise coming back through an extract outlet when the fan is off, and on shared or multi-outlet systems it stops one extract point discharging into another. On any run terminating externally without a self-closing grille, it keeps wind from pushing back down the duct.\"}},\n    {\"@type\":\"Question\",\"name\":\"Do you supply dampers for trade and project work?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. We supply M\u0026E contractors, installers, developers and facilities teams, and hold stock from 100mm to 600mm for next day delivery. Send the drawings, the fire strategy or a damper schedule and we will price it, confirm ratings against the compartment lines, and flag anywhere access looks like it has not been allowed for. Call 0161 399 3825 or email hello@efans.co.uk.\"}}\n  ]\n}\n\u003c\/script\u003e","products":[{"product_id":"back-draught-damper","title":"Back Draught Damper","description":"\u003cp\u003eThe Systemair Back Draught Damper prevents air flowing back into a circular duct when the fan is off. It is made from galvanised sheet steel with two spring-loaded blades that open with airflow and close against back draught.\u003c\/p\u003e\u003cp\u003eBecause the blades are spring-loaded, the damper can be mounted vertically as well as horizontally. Available from 100mm to 315mm diameter.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e100mm to 315mm diameter\u003c\/li\u003e\n\u003cli\u003eBack draught damper\u003c\/li\u003e\n\u003cli\u003eSpring-loaded blades\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystemair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBack draught damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamper shape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCircular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlades\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo spring-loaded blades\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGalvanised sheet steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm to 315mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVertical or horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Systemair","offers":[{"title":"100mm dia","offer_id":33313484570757,"sku":"EF5597","price":24.0,"currency_code":"GBP","in_stock":true},{"title":"125mm dia","offer_id":33313484603525,"sku":"EF5598","price":30.27,"currency_code":"GBP","in_stock":true},{"title":"150mm dia","offer_id":33313484636293,"sku":"EF5599","price":31.92,"currency_code":"GBP","in_stock":true},{"title":"200mm dia","offer_id":33313484669061,"sku":"EF5602","price":34.19,"currency_code":"GBP","in_stock":true},{"title":"250mm dia","offer_id":33313484701829,"sku":"EF5603","price":47.74,"currency_code":"GBP","in_stock":true},{"title":"315mm dia","offer_id":33313484734597,"sku":"EF5604","price":64.89,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/E-SYS-20813-RSK-IMG-CAT4.jpg?v=1599251371"},{"product_id":"systemair-vk-gravity-louvre-shutter","title":"Systemair VK Gravity Louvre Shutter","description":"\u003cp\u003eThe Systemair VK Gravity Louvre Shutter is a square, wall-mounted backdraught shutter for exhaust air. Its profiled vanes create a strong upward force that lowers air resistance, so they open fully even at low air velocities and close automatically when the fan stops. It is manufactured from weather-resistant, UV-robust PVC.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSquare louvre shutter for vertical wall mounting\u003c\/li\u003e\n\u003cli\u003eFor exhaust air, with automatic open and close of the vanes\u003c\/li\u003e\n\u003cli\u003eProfiled vanes open fully even at low air velocities\u003c\/li\u003e\n\u003cli\u003eWeather-resistant, UV-robust PVC\u003c\/li\u003e\n\u003cli\u003eTemperature range -30 to +60 degrees C (air velocity up to 12 m\/s)\u003c\/li\u003e\n\u003cli\u003eAvailable in 10 sizes, mounting set included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBackdraught protection on wall-mounted exhaust outlets\u003c\/li\u003e\n\u003cli\u003ePreventing draughts and weather ingress when the fan is off\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eMounts vertically on the wall using the included wall plugs and screws. Keep air velocity below 12 m\/s.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystemair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGravity louvre shutter (backdraught)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVK10 to VK50 (10 sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomatic gravity open and close\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWeather-resistant PVC (UV-robust)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-30 to +60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax air velocity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 m\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLight grey RAL 7035 (VK10 white RAL 9010)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVertical wall (mounting set included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eManuals \u0026amp; Guides\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Systemair_Louvre_Shutter.pdf\" target=\"_blank\" rel=\"noopener\"\u003eSystemair VK Louvre Shutter Datasheet\u003c\/a\u003e\u003c\/p\u003e","brand":"Systemair","offers":[{"title":"VK 10 - 142mm Sq","offer_id":33318060884101,"sku":"87682","price":34.79,"currency_code":"GBP","in_stock":true},{"title":"VK 12 - 164mm Sq","offer_id":33318060916869,"sku":"87685","price":36.87,"currency_code":"GBP","in_stock":true},{"title":"VK 15 - 178mm Sq","offer_id":33318060982405,"sku":"87679","price":51.28,"currency_code":"GBP","in_stock":true},{"title":"VK 20 - 245mm Sq","offer_id":33318061015173,"sku":"5639","price":71.49,"currency_code":"GBP","in_stock":true},{"title":"VK 25 - 299mm Sq","offer_id":33318061047941,"sku":"5640","price":78.29,"currency_code":"GBP","in_stock":true},{"title":"VK 30 - 347mm Sq","offer_id":33318061080709,"sku":"5641","price":84.69,"currency_code":"GBP","in_stock":true},{"title":"VK 35 - 397mm Sq","offer_id":33318061113477,"sku":"5642","price":96.39,"currency_code":"GBP","in_stock":true},{"title":"VK 40 - 460mm Sq","offer_id":33318061146245,"sku":"5643","price":106.59,"currency_code":"GBP","in_stock":true},{"title":"VK 45 - 501mm Sq","offer_id":33318061179013,"sku":"5645","price":120.99,"currency_code":"GBP","in_stock":true},{"title":"VK 50 - 549mm Sq","offer_id":33318061211781,"sku":"5646","price":141.14,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/VK1_001.jpg?v=1619531379"},{"product_id":"single-blade-circular-volume-control-damper","title":"Single Blade Circular Volume Control Damper","description":"\u003cp\u003eThe Single Blade Circular Volume Control Damper regulates air volume in circular ducts, with a plastic manual adjustment handle that locks the blade in the required position without tools. It is a low-tightness A-casing single-blade damper.\u003c\/p\u003e\u003cp\u003eMade from galvanised steel with PPO plastic bushings, it is available from 100mm to 355mm diameter. Maximum air temperature is 80°C and maximum duct pressure is 500 Pa.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e100mm to 355mm diameter\u003c\/li\u003e\n\u003cli\u003eSingle blade volume control damper\u003c\/li\u003e\n\u003cli\u003eManual handle\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle blade volume control damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamper shape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCircular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCasing class\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA-casing, 1-blade (low tightness)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAdjustment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic manual handle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm to 355mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax duct pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 Pa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGalvanised steel, PPO bushings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"100mm","offer_id":33477294882949,"sku":"52567","price":29.01,"currency_code":"GBP","in_stock":true},{"title":"125mm","offer_id":33477294915717,"sku":"52568","price":34.39,"currency_code":"GBP","in_stock":true},{"title":"150mm","offer_id":33477294948485,"sku":"52569","price":32.24,"currency_code":"GBP","in_stock":true},{"title":"200mm","offer_id":33477294981253,"sku":"52572","price":33.22,"currency_code":"GBP","in_stock":true},{"title":"250mm","offer_id":33477295014021,"sku":"52573","price":36.65,"currency_code":"GBP","in_stock":true},{"title":"315mm","offer_id":33477295046789,"sku":"52575","price":43.17,"currency_code":"GBP","in_stock":true},{"title":"355mm","offer_id":33477295079557,"sku":"52576","price":57.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/TuneRangeVolumeControlDamperInDuctManualCircular.jpg?v=1599251382"},{"product_id":"systemair-fire-damper-in-duct-circular-pki-range","title":"Systemair Fire Damper In-Duct Circular (PKI Range)","description":"\u003cp\u003eSystemair Fire Damper In-Duct Circular (PKI Range) are designed to fit inside spiral ductwork. Fire dampers represent passive fire protection, designed with the help of compartmentalisation to prevent the spread of toxic gases, smoke and fire. They are are designed and certified in accordance with the test criteria’s EIS according to EN 1366–2.\u003c\/p\u003e\n\u003cp\u003eA fire damper together with its installation form an inseparable part of the fire resistivity rating.\u003c\/p\u003e\n\u003cp\u003eThe Damper closes after the melting of the thermal fuse. After the closing of the damper blade, it is mechanically locked in the closed position and can only be opened manually, which requires access of the maintenance staff into the duct.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003e✓ \u003c\/span\u003eSpiral ductwork\u003cbr\u003e\u003cspan\u003e✓ P\u003c\/span\u003ereventing the spread of toxic gases, smoke and fire.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystemair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003eTechnical Data\u003c\/strong\u003e\u003cbr\u003eThe actuating mechanism is activated when the temperature of the air in the duct reaches 72°C.\u003c\/p\u003e\n\u003cp\u003e• PKI-dia-120 Circular fire damper with a maximum fire resistivity of 120 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eManuals \u0026amp; Guides\u003c\/b\u003e\u003cbr\u003e\u003ca title=\"Data Sheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Systemair_PKI-C-EI120S-100-ZV.pdf?v=1612862610\"\u003e\u003cspan\u003eSystemair Fire Damper In-Duct Circular PKI 100 Dia (120 mins) Datasheet\u003c\/span\u003e\u003c\/a\u003e\u003cbr\u003e \u003ca title=\"Data Sheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Systemair_PKI-C-EI120S-125-ZV.pdf?v=1612862610\"\u003eSystemair Fire Damper In-Duct Circular PKI 125 Dia (120 mins) Datasheet\u003c\/a\u003e\u003cbr\u003e \u003ca title=\"Data Sheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Systemair_PKI-C-EI120S-150-ZV.pdf?v=1612862610\"\u003eSystemair Fire Damper In-Duct Circular PKI 150 Dia (120 mins) Datasheet\u003c\/a\u003e\u003cbr\u003e \u003ca title=\"Data Sheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Systemair_PKI-C-EI120S-200-ZV.pdf?v=1612862610\"\u003eSystemair Fire Damper In-Duct Circular PKI 200 Dia (120 mins) Datasheet\u003c\/a\u003e\u003cbr\u003e \u003ca title=\"Systemair Fire Damper In-Duct Circular (PKI Range) User Manual\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/A-PKI-C_USERMANUAL_ENG_GLO_USERMANUAL_PKI-C_EN.PDF?v=1653908748\" target=\"_blank\"\u003eSystemair Fire Damper In-Duct Circular (PKI Range) User Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Systemair","offers":[{"title":"100mm dia 120 mins","offer_id":33482561650821,"sku":"238105","price":58.06,"currency_code":"GBP","in_stock":true},{"title":"125mm dia 120 mins","offer_id":33482561781893,"sku":"238107","price":64.99,"currency_code":"GBP","in_stock":true},{"title":"150mm dia 120 mins","offer_id":33482562011269,"sku":"238109","price":79.77,"currency_code":"GBP","in_stock":true},{"title":"200mm dia 120 mins","offer_id":33482562240645,"sku":"238112","price":105.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/FC2_2f4efb73-4b81-44e9-b084-098794ed71fb.png?v=1791313001"},{"product_id":"square-intumescent-air-transfer-fire-block-150mm","title":"Square Intumescent Air Transfer Fire Block - 150mm","description":"\u003cp\u003eThe 150mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e150 x 150mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150mm x 150mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203408990341,"sku":"LV40150150","price":40.76,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper.jpg?v=1613161901"},{"product_id":"square-intumescent-air-transfer-fire-block-200mm","title":"Square Intumescent Air Transfer Fire Block - 200mm","description":"\u003cp\u003eThe 200mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e200 x 200mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200mm x 200mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203428487301,"sku":"LV40200200","price":58.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_301e3f10-a440-4a51-be04-8fd038fb4c54.jpg?v=1613161902"},{"product_id":"square-intumescent-air-transfer-fire-block-250mm","title":"Square Intumescent Air Transfer Fire Block - 250mm","description":"\u003cp\u003eThe 250mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e250 x 250mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250mm x 250mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203428913285,"sku":"LV40250250","price":63.38,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_7a8df80f-0a03-44e4-aff0-5ddd126ac14a.jpg?v=1613161903"},{"product_id":"square-intumescent-air-transfer-fire-block-300mm","title":"Square Intumescent Air Transfer Fire Block - 300mm","description":"\u003cp\u003eThe 300mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e300 x 300mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300mm x 300mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203431927941,"sku":"LV40300300","price":63.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_6f60d93e-c883-4545-a3b3-9e2cfed6a1cd.jpg?v=1613161904"},{"product_id":"square-intumescent-air-transfer-fire-block-350mm","title":"Square Intumescent Air Transfer Fire Block - 350mm","description":"\u003cp\u003eThe 350mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e350 x 350mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e350mm x 350mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203432059013,"sku":"LV40350350","price":87.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_9b63b23d-cdf1-443b-8822-6cf59dc29c78.jpg?v=1613161905"},{"product_id":"square-intumescent-air-transfer-fire-block-400mm","title":"Square Intumescent Air Transfer Fire Block - 400mm","description":"\u003cp\u003eThe 400mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e400 x 400mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400mm x 400mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203433533573,"sku":"LV40400400","price":107.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_b027aee0-0f9e-4ac1-952d-603c23454cd6.jpg?v=1613161905"},{"product_id":"square-intumescent-air-transfer-fire-block-450mm","title":"Square Intumescent Air Transfer Fire Block - 450mm","description":"\u003cp\u003eThe 450mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e450 x 450mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e450mm x 450mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203434385541,"sku":"LV40450450","price":137.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_f04f3eaa-186a-4eb5-8c0c-d91e57ac609d.jpg?v=1613161906"},{"product_id":"square-intumescent-air-transfer-fire-block-500mm","title":"Square Intumescent Air Transfer Fire Block - 500mm","description":"\u003cp\u003eThe 500mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. 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Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cp\u003eEach fire block is made to order, so please allow approximately one week for delivery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e500 x 500mm\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent air transfer fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500mm x 500mm x 38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":34203435958405,"sku":"LV40500500","price":217.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/fire-block-damper_c868baee-4197-44ac-a144-ee50756db1a4.jpg?v=1613161907"},{"product_id":"square-intumescent-air-transfer-fire-block-600mm","title":"Square Intumescent Air Transfer Fire Block - 600mm","description":"\u003cp\u003eThe 600mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. 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RA Backdraft Shutter","description":"\u003cspan\u003e\u003cspan\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003cbr\u003eBackdraught shutter for use with \u003c\/span\u003e\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eSystemair RAW Roof Fan Cowl Side Discharge 630\/710mm\u003c\/span\u003e","brand":"Systemair","offers":[{"title":"Default Title","offer_id":34235279835269,"sku":"8676","price":241.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/SHUTTERS1_250X218_c2ac719a-a411-4b8f-ac25-e7eb92f19030.jpg?v=1591388761"},{"product_id":"systemair-bds-800-ra-backdraft-shutter","title":"Systemair BDS 800 RA Backdraft Shutter","description":"\u003cspan\u003e\u003cspan\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003cbr\u003eBackdraught shutter for use with \u003c\/span\u003e\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eSystemair RAW Roof Fan Cowl Side Discharge 800mm\u003c\/span\u003e","brand":"Systemair","offers":[{"title":"Default Title","offer_id":34235298840709,"sku":"8677","price":286.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/SHUTTERS2_265X250_f1e72e4b-0e1c-4c0b-b4d0-495d901256e2.jpg?v=1591388762"},{"product_id":"systemair-bds-1000-ra-backdraft-shutter","title":"Systemair BDS 1000 RA backdraft shutter","description":"\u003cspan\u003e\u003cstrong\u003eProduct Description\u003cbr\u003e\u003c\/strong\u003eBackdraught shutter for use with the Systemair RAW Roof Fan Cowl Side Discharge 1000mm\u003cbr\u003e\u003c\/span\u003e","brand":"Systemair","offers":[{"title":"Default Title","offer_id":34235304509573,"sku":"8678","price":323.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/SHUTTERS2_265X250_4a79ef6e-4cce-4200-ae6f-bee0a32b81a0.jpg?v=1591388759"},{"product_id":"bsb-fd-c-series-circular-single-blade-externally-resettable-combination-fire-and-volume-control-damper","title":"BSB FD-C Series Circular Single Blade Externally Resettable Combination Fire and Volume Control Damper","description":"\u003cp\u003eThe BSB FD-C Series is a manually operated single-blade circular fire damper with an integrated volume control facility, designed for installations where space is at a premium. The damper, thermal fuse and reset are all accessed from outside the duct, making commissioning and maintenance straightforward.\u003c\/p\u003e\u003cp\u003eIt is an ES-classified fire damper with reduced smoke leakage (BS EN 1366-2), air-control tested to BS EN 1751, with a casing conforming to BS EN 1506, a replaceable fusible link, and an external blade position indicator. The standard case length is 320mm and it is available in 8 sizes from 100mm to 315mm diameter.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e100mm to 315mm diameter\u003c\/li\u003e\n\u003cli\u003eFire + volume control damper\u003c\/li\u003e\n\u003cli\u003eExternally resettable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFD-C Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCombination fire and volume control damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamper shape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCircular single blade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClassification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eES (BS EN 1366-2), reduced smoke leakage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBS EN 1751 (air control), BS EN 1506 (casing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCase length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e320mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm to 315mm diameter (8 sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReset\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExternally resettable, replaceable fusible link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/BSB_FD-C_Fire_Damper_Datasheet.pdf?v=1620436499\" title=\"Data Sheet\" target=\"_blank\"\u003eBSB FD-C Series Circular Single Blade Data Sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"BSB","offers":[{"title":"100mm dia","offer_id":34641218175132,"sku":"EF100-FD","price":85.99,"currency_code":"GBP","in_stock":true},{"title":"125mm dia","offer_id":34641236066460,"sku":"EF125-FD","price":89.99,"currency_code":"GBP","in_stock":true},{"title":"150mm dia","offer_id":34641329553564,"sku":"EF150-FD","price":94.99,"currency_code":"GBP","in_stock":true},{"title":"160mm dia","offer_id":34641383653532,"sku":"EF160-FD","price":99.99,"currency_code":"GBP","in_stock":true},{"title":"200mm dia","offer_id":34641394237596,"sku":"EF200-FD","price":109.99,"currency_code":"GBP","in_stock":true},{"title":"250mm dia","offer_id":34641397055644,"sku":"EF250-FD","price":121.99,"currency_code":"GBP","in_stock":true},{"title":"300mm dia","offer_id":34641400823964,"sku":"EF300-FD","price":129.99,"currency_code":"GBP","in_stock":true},{"title":"315mm dia","offer_id":34641418158236,"sku":"EF315-FD","price":133.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/bsb-fire-damper.jpg?v=1733757345"},{"product_id":"air-valve-with-fire-damper","title":"Air Valve With Fire Damper","description":"\u003cp\u003eThe Air Valve With Fire Damper is a FläktWoods KSOF exhaust valve that doubles as a fire damper, stopping fire and smoke spreading into the duct system. It is CE marked to EN 15650:2010 and tested to EN 1366-2, and has a low sound level with good natural sound attenuation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExhaust valve and fire damper in one\u003c\/li\u003e\n\u003cli\u003eCE marked to EN 15650:2010, tested to EN 1366-2\u003c\/li\u003e\n\u003cli\u003eSpring-loaded fusible link closes the valve at 70°C\u003c\/li\u003e\n\u003cli\u003eHot-galvanised steel, powder-coated white (RAL 9010) with CleanVent coating as standard\u003c\/li\u003e\n\u003cli\u003eGood natural sound attenuation and low sound level\u003c\/li\u003e\n\u003cli\u003eSuitable for horizontal and vertical ducting\u003c\/li\u003e\n\u003cli\u003eSupplied with its KKT mounting ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eExhaust ventilation systems requiring fire and smoke containment\u003c\/li\u003e\n\u003cli\u003eFire-rated wall and floor duct penetrations (E45 to E120 depending on installation)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eSupplied complete with a spring-loaded fuse and fixed by a screwing action, locating the valve lugs into the indents in the supplied KKT mounting ring. Suitable for horizontal and vertical ducting. Should be installed in line with the building fire strategy by a competent installer.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFläktWoods\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eKSOF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFire damper exhaust valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100, 125, 150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE marked EN 15650:2010 (tested EN 1366-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eE45 to E120 per installation (EN 13501-3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFusible link\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCloses at 70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAirflow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e122 to 288 m³\/h by size (at 30 dB(A))\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHot-galvanised steel, powder-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite RAL 9010 (CleanVent coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCeiling or wall (KKT ring supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eManuals \u0026amp; Guides\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Air_Valve_Fire_Damper_KSOF_Datasheet.pdf\" target=\"_blank\" rel=\"noopener\"\u003eAir Valve With Fire Damper (KSOF) Datasheet\u003c\/a\u003e\u003c\/p\u003e","brand":"FlaktWoods","offers":[{"title":"100mm","offer_id":37801976332444,"sku":"KSOF100","price":78.34,"currency_code":"GBP","in_stock":true},{"title":"125mm","offer_id":53478919930235,"sku":"KSOF125","price":86.42,"currency_code":"GBP","in_stock":true},{"title":"150mm","offer_id":37801976365212,"sku":"KSOF150","price":94.51,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/valve-damper.jpg?v=1613486731"},{"product_id":"circular-intumescent-fire-block-100mm-52935","title":"Circular Intumescent Fire Block 100mm - 52935","description":"\u003cp\u003eThe 100mm Circular Intumescent Fire Block fits 100mm diameter spiral ducting and seals the duct in a fire while allowing air transfer in normal use. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e100mm diameter\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts (fits spiral duct)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Fireblock-Datasheet.pdf?v=1655825145\" title=\"Circular Intumescent Fire Block Data Sheet\" target=\"_blank\"\u003eCircular Intumescent Fire Block Data Sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":46460436054337,"sku":"52935","price":79.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/FBCCirularWallDoorMount_2de2f60f-e7e7-47ac-a714-7ed323f8b1ec.jpg?v=1692979838"},{"product_id":"circular-intumescent-fire-block-125mm-52930","title":"Circular Intumescent Fire Block 125mm - 52930","description":"\u003cp\u003eThe 125mm Circular Intumescent Fire Block fits 125mm diameter spiral ducting and seals the duct in a fire while allowing air transfer in normal use. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e125mm diameter\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts (fits spiral duct)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Fireblock-Datasheet.pdf?v=1655825145\" title=\"Circular Intumescent Fire Block Data Sheet\" target=\"_blank\"\u003eCircular Intumescent Fire Block Data Sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":46460448440641,"sku":"52930","price":90.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/FBCCirularWallDoorMount_f7543556-2ab4-4129-a3ae-affe424e52a6.jpg?v=1692979999"},{"product_id":"circular-intumescent-fire-block-150mm-52931","title":"Circular Intumescent Fire Block 150mm - 52931","description":"\u003cp\u003eThe 150mm Circular Intumescent Fire Block fits 150mm diameter spiral ducting and seals the duct in a fire while allowing air transfer in normal use. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e150mm diameter\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts (fits spiral duct)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Fireblock-Datasheet.pdf?v=1655825145\" title=\"Circular Intumescent Fire Block Data Sheet\" target=\"_blank\"\u003eCircular Intumescent Fire Block Data Sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":46460455846209,"sku":"52931","price":101.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/FBCCirularWallDoorMount_89919b0e-ebc3-4132-ae6f-415dbf0392e7.jpg?v=1692980074"},{"product_id":"circular-intumescent-fire-block-200mm-52932","title":"Circular Intumescent Fire Block 200mm - 52932","description":"\u003cp\u003eThe 200mm Circular Intumescent Fire Block fits 200mm diameter spiral ducting and seals the duct in a fire while allowing air transfer in normal use. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.\u003c\/p\u003e\u003cp\u003eSlim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black\/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e200mm diameter\u003c\/li\u003e\n\u003cli\u003eIntumescent fire block\u003c\/li\u003e\n\u003cli\u003eUp to 120 min in walls and ducts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVertical and horizontal ducted ventilation systems\u003c\/li\u003e\n\u003cli\u003eAirflow control and fire protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntumescent fire block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (timber doors)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFire rating (walls and ducts)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 60%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoors, walls, ducts (fits spiral duct)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\/grey (other colours on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Year Manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/Fireblock-Datasheet.pdf?v=1655825145\" title=\"Circular Intumescent Fire Block Data Sheet\" target=\"_blank\"\u003eCircular Intumescent Fire Block Data Sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"eFans","offers":[{"title":"Default Title","offer_id":46460463251777,"sku":"52932","price":115.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/FBCCirularWallDoorMount_31c7426e-7a65-4a0d-9aca-b105c292601e.jpg?v=1692980151"},{"product_id":"bsb-fd-series-circular-curtain-fire-damper","title":"BSB FD Series Circular Curtain Fire Damper with Angle Frame","description":"\u003cp\u003eThe BSB FD Series circular curtain fire damper is a mechanical, fusible link fire damper for circular ductwork passing through fire rated walls, floors and cavity barriers. When duct air reaches 72°C the link melts and a spring-loaded steel curtain closes across the duct, maintaining the compartment. Each damper is supplied with an angle frame for building in.\u003c\/p\u003e\n\u003cp\u003eBecause the folded curtain sits clear of the airstream in normal running, pressure drop and noise are very low, which makes it a good choice for larger ducts and higher air velocities. It is made to order by BSB in the UK.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e100mm to 630mm diameter (11 sizes)\u003c\/li\u003e\n\u003cli\u003eE classified to BS EN 13501-3, up to E120 depending on installation\u003c\/li\u003e\n\u003cli\u003eSupplied with angle frame\u003c\/li\u003e\n\u003cli\u003eMade to order, approx. 1 week lead time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is best used for\u003c\/h3\u003e\n\u003cp\u003eDucted supply and extract systems in commercial buildings, schools, healthcare and residential blocks where a circular duct passes through a fire compartment wall or floor. It suits plant room and riser penetrations, and larger diameter mains where a single-blade damper would add noticeable resistance.\u003c\/p\u003e\n\u003ch3\u003eCurtain blade or FD-C?\u003c\/h3\u003e\n\u003cp\u003eOur \u003ca href=\"\/products\/bsb-fd-c-series-circular-single-blade-externally-resettable-combination-fire-and-volume-control-damper\"\u003eBSB FD-C\u003c\/a\u003e is a single-blade damper with external reset, volume control and an ES (reduced smoke leakage) rating, but only goes up to 315mm. The FD Series curtain damper is E rated (integrity), is tested and reset through an access panel in the ductwork, and covers sizes up to 630mm. If the specification calls for ES or you need external reset in a tight ceiling void, choose FD-C. For larger ducts, low pressure loss or a straightforward like-for-like curtain damper replacement, choose this one.\u003c\/p\u003e\n\u003ch3\u003eInstallation notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall to BSB's tested installation method for the wall or floor type, using the supplied angle frame, so the fire rating is valid.\u003c\/li\u003e\n\u003cli\u003eAllow at least 75mm clearance to adjacent walls, floors and ceilings, and use break-away joints on the connecting ductwork.\u003c\/li\u003e\n\u003cli\u003eFit an access panel next to the damper. Fire dampers must be drop tested and inspected at least annually (BS 9999 Annex W) and records kept under the Regulatory Reform (Fire Safety) Order.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMade to order\u003c\/h3\u003e\n\u003cp\u003eThese dampers are built to order and are not held in stock. The current lead time is around 1 week from order. Because they are made to order they cannot be returned or cancelled, so please check the duct diameter before ordering. Need a size or option not listed, such as stainless steel, a HEVAC frame or a microswitch? Email \u003ca href=\"mailto:hello@efans.co.uk\"\u003ehello@efans.co.uk\u003c\/a\u003e or call 0161 399 3825 for a quote.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFD Series, circular (type C), galvanised, angle frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMechanical curtain blade fire damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClassification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eE rated, BS EN 13501-3, tested to BS EN 1366-2, up to E120 depending on installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBS EN 15650, BS EN 1751 Class 2 blade leakage, LPS 1162, DW 144\/145\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFusible link\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGalvanised steel casing (min 1.2mm) and curtain blades, stainless steel closure springs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAngle frame (AF) supplied\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm to 630mm diameter (11 sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTesting and reset\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVia access panel in ductwork\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/BSB_FD_Series_Curtain_Fire_Damper_Datasheet.pdf?v=1791486768\" target=\"_blank\"\u003eBSB FD Series Curtain Fire Damper Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eBrowse our full range of \u003ca href=\"\/collections\/fire-dampers\"\u003efire dampers\u003c\/a\u003e.\u003c\/p\u003e","brand":"BSB","offers":[{"title":"100mm dia","offer_id":56497055433083,"sku":"CFDAF100","price":84.99,"currency_code":"GBP","in_stock":true},{"title":"125mm dia","offer_id":56497055465851,"sku":"CFDAF125","price":85.99,"currency_code":"GBP","in_stock":true},{"title":"150mm dia","offer_id":56497055498619,"sku":"CFDAF150","price":86.99,"currency_code":"GBP","in_stock":true},{"title":"200mm dia","offer_id":56497055531387,"sku":"CFDAF200","price":88.99,"currency_code":"GBP","in_stock":true},{"title":"315mm dia","offer_id":56497055564155,"sku":"CFDAF315","price":105.99,"currency_code":"GBP","in_stock":true},{"title":"355mm dia","offer_id":56497055596923,"sku":"CFDAF355","price":111.99,"currency_code":"GBP","in_stock":true},{"title":"400mm dia","offer_id":56497055629691,"sku":"CFDAF400","price":116.99,"currency_code":"GBP","in_stock":true},{"title":"450mm dia","offer_id":56497055662459,"sku":"CFDAF450","price":130.99,"currency_code":"GBP","in_stock":true},{"title":"500mm dia","offer_id":56497055695227,"sku":"CFDAF500","price":151.99,"currency_code":"GBP","in_stock":true},{"title":"560mm dia","offer_id":56497055727995,"sku":"CFDAF560","price":187.99,"currency_code":"GBP","in_stock":true},{"title":"630mm dia","offer_id":56497055760763,"sku":"CFDAF630","price":194.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/bsb-fd-circular-curtain-fire-damper.jpg?v=1791487299"},{"product_id":"bsb-fd-r-series-rectangular-fire-damper","title":"BSB FD-R Series Rectangular Fire Damper 100x100 to 300x300mm","description":"\u003cp\u003eThe BSB FD-R Series is a mechanical single-blade fire damper for rectangular ductwork passing through fire rated walls and floors, with built-in volume control. The damper, fusible link and reset are all accessed from outside the duct, so it can be drop tested and reset without opening the ductwork, which makes commissioning and annual testing much quicker in tight ceiling voids.\u003c\/p\u003e\n\u003cp\u003eIt is ES classified (reduced smoke leakage) to BS EN 1366-2, and can be installed from one side of the wall without fire rated infill material. Made to order by BSB in the UK.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e15 sizes from 100 x 100mm to 300 x 300mm\u003c\/li\u003e\n\u003cli\u003eES rated, up to E120 S depending on installation\u003c\/li\u003e\n\u003cli\u003eExternally resettable, with built-in volume control\u003c\/li\u003e\n\u003cli\u003eMade to order, approx. 1 week lead time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it is best used for\u003c\/h3\u003e\n\u003cp\u003eSmaller rectangular supply and extract ducts in offices, schools, healthcare, hotels and residential blocks where the duct passes through a fire compartment wall or floor. It is especially useful where access is limited, because testing and resetting are done from outside the duct.\u003c\/p\u003e\n\u003ch3\u003eFD-R, FD-C or curtain damper?\u003c\/h3\u003e\n\u003cp\u003eThe FD-R is the rectangular version of our \u003ca href=\"\/products\/bsb-fd-c-series-circular-single-blade-externally-resettable-combination-fire-and-volume-control-damper\"\u003eBSB FD-C\u003c\/a\u003e circular damper: same single-blade, externally resettable design with volume control. For circular ducts choose FD-C, or the \u003ca href=\"\/products\/bsb-fd-series-circular-curtain-fire-damper\"\u003eBSB FD Series curtain damper\u003c\/a\u003e for circular sizes above 315mm. For rectangular ducts larger than 300 x 300mm, contact us for a curtain damper quote.\u003c\/p\u003e\n\u003ch3\u003eInstallation notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall to BSB's tested method for the wall or floor type using the supplied frame, so the fire rating is valid. It fixes from one side only with no infill needed.\u003c\/li\u003e\n\u003cli\u003eLeave a 10mm gap around the damper, at least 75mm to adjacent walls, floors and ceilings, and use break-away joints on the connecting ductwork.\u003c\/li\u003e\n\u003cli\u003eFire dampers must be inspected and drop tested regularly (BS 9999) with records kept under the Regulatory Reform (Fire Safety) Order. BSB recommend intervals of no more than six months.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMade to order\u003c\/h3\u003e\n\u003cp\u003eThese dampers are built to order and are not held in stock. The current lead time is around 1 week from order. Because they are made to order they cannot be returned or cancelled, so please check the duct width and height before ordering. Need a size not listed? Email \u003ca href=\"mailto:hello@efans.co.uk\"\u003ehello@efans.co.uk\u003c\/a\u003e or call 0161 399 3825 for a quote.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable width=\"100%\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFD-R Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle-blade rectangular fire damper with volume control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClassification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eES, tested to BS EN 1366-2, classified to BS EN 13501-3. E120 S in masonry floors; E120 \/ E60 S in drywall and masonry walls (see datasheet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBS EN 15650 (CE marked), BS EN 1751 Class 2 blade \/ Class C case leakage, DW 144\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFusible link\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72°C, externally replaceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGalvanised steel case (0.9mm), 1.2mm galvanised steel blade with intumescent seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCase length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300mm to 400mm depending on height\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 x 100mm to 300 x 300mm (15 sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReset\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExternal test and reset, external blade position indicator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order, approx. 1 week\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eManuals \u0026amp; Guides\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/BSB_FD-R_Series_Fire_Damper_Datasheet.pdf?v=1791549540\" target=\"_blank\"\u003eBSB FD-R Series Fire Damper Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eBrowse our full range of \u003ca href=\"\/collections\/fire-dampers\"\u003efire dampers\u003c\/a\u003e.\u003c\/p\u003e","brand":"BSB","offers":[{"title":"100 x 100mm","offer_id":56498909315451,"sku":"FD-R100-100","price":96.99,"currency_code":"GBP","in_stock":true},{"title":"150 x 100mm","offer_id":56498909348219,"sku":"FD-R150-100","price":97.99,"currency_code":"GBP","in_stock":true},{"title":"150 x 150mm","offer_id":56498909380987,"sku":"FD-R150-150","price":99.99,"currency_code":"GBP","in_stock":true},{"title":"200 x 100mm","offer_id":56498909413755,"sku":"FD-R200-100","price":97.99,"currency_code":"GBP","in_stock":true},{"title":"200 x 150mm","offer_id":56498909446523,"sku":"FD-R200-150","price":101.99,"currency_code":"GBP","in_stock":true},{"title":"200 x 200mm","offer_id":56498909479291,"sku":"FD-R200-200","price":107.99,"currency_code":"GBP","in_stock":true},{"title":"250 x 100mm","offer_id":56498909512059,"sku":"FD-R250-100","price":98.99,"currency_code":"GBP","in_stock":true},{"title":"250 x 150mm","offer_id":56498909544827,"sku":"FD-R250-150","price":103.99,"currency_code":"GBP","in_stock":true},{"title":"250 x 200mm","offer_id":56498909577595,"sku":"FD-R250-200","price":114.99,"currency_code":"GBP","in_stock":true},{"title":"250 x 250mm","offer_id":56498909610363,"sku":"FD-R250-250","price":126.99,"currency_code":"GBP","in_stock":true},{"title":"300 x 100mm","offer_id":56498909643131,"sku":"FD-R300-100","price":101.99,"currency_code":"GBP","in_stock":true},{"title":"300 x 150mm","offer_id":56498909675899,"sku":"FD-R300-150","price":113.99,"currency_code":"GBP","in_stock":true},{"title":"300 x 200mm","offer_id":56498909708667,"sku":"FD-R300-200","price":125.99,"currency_code":"GBP","in_stock":true},{"title":"300 x 250mm","offer_id":56498909741435,"sku":"FD-R300-250","price":138.99,"currency_code":"GBP","in_stock":true},{"title":"300 x 300mm","offer_id":56498909774203,"sku":"FD-R300-300","price":146.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/019b-compressed-2048x1365.jpg?v=1791549606"}],"url":"https:\/\/www.efans.co.uk\/collections\/dampers.oembed?page=2","provider":"eFans Direct Ltd","version":"1.0","type":"link"}