{"title":"Multivent Systems","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.collection__description,.collection__description .rte{overflow:visible!important}\n\n#efans-subnav{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:44px 0 4px;padding:4px 0 8px;position:relative}\n#efans-subnav \u003e a{flex:0 0 auto;white-space:nowrap;display:inline-flex;align-items:center;padding:12px 14px;border:1px solid #d6d6d6;border-radius:999px;background:#fff;color:#222;font-size:14px;font-weight:500;line-height:1.3;text-decoration:none;cursor:pointer;transition:border-color .15s,background-color .15s,color .15s}\n#efans-subnav \u003e a:hover{border-color:#000;color:#000}\n#efans-subnav \u003e a.efx-active,#efans-subnav \u003e a.efx-active:hover{background:#000;border-color:#000;color:#fff}\n#efans-subnav \u003e a.efx-active::after{content:\"\\00d7\";margin-left:8px;font-size:16px;line-height:1}\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\u003eA Multivent is a central MEV unit: one fan, mounted in a loft or cupboard, that extracts continuously from several wet rooms at once through ducting, so a kitchen, bathroom, en suite and utility room can all be ventilated from a single quiet unit instead of four separate extractor fans. We stock the Vent-Axia Multivent range, including the Lo-Carbon MVDC-MS, the MVDC-MSH with a built-in humidity sensor, the Sentinel Multivent and the app-controlled Sentinel Multivent Plus HX, alongside the Greenwood CMEV.4E and CMEV.4eHT central ventilation units, with next working day delivery on stocked lines. Send us the room list and we will size the unit and ducting with you: email \u003ca href=\"mailto:hello@efans.co.uk\"\u003ehello@efans.co.uk\u003c\/a\u003e or call \u003ca href=\"tel:01613993825\"\u003e0161 399 3825\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\u003eHow a Multivent MEV system works\u003c\/h2\u003e\n\u003cp\u003eThe unit sits centrally, usually in the loft or a cupboard, with a duct running from each wet room to its own spigot. It runs all the time at a low trickle rate, which keeps moisture from building up, and switches to a higher boost rate when a light is switched on or, on humidity models, when the air in a room gets damp. Fresh replacement air comes in through trickle vents in the windows of the living rooms and bedrooms. Because there is one fan instead of several, there is only one motor to power, one unit to service and far less noise in the rooms themselves.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is a Multivent extractor fan?\u003c\/h3\u003e\n\u003cp\u003eMultivent is Vent-Axia's name for its central mechanical extract ventilation (MEV) units, and it has become the everyday term for any multi vent extractor fan of this type. Instead of a fan in every room, one unit with several extract spigots is ducted to each wet room and runs continuously at a low trickle speed, boosting when a room is in use or humidity rises. The stale air is discharged through a single duct to outside. Greenwood's equivalent is the CMEV central ventilation unit.\u003c\/p\u003e\n\n\u003ch3\u003eMEV, MVHR or PIV: what is the difference?\u003c\/h3\u003e\n\u003cp\u003eMEV extracts only. It pulls moist air out of the wet rooms and replacement air comes in through trickle vents in the windows, so there is no supply ducting and no heat recovery. MVHR extracts and supplies through two duct networks and recovers heat from the outgoing air, which makes it the better choice for airtight new builds but a much bigger installation. PIV pushes filtered air in from the loft rather than extracting. For a house with trickle vents where you want every wet room covered by one quiet unit, MEV is usually the simplest and cheapest compliant option. See our \u003ca href=\"\/collections\/whole-house-heat-recovery-mvhr\"\u003ewhole house MVHR\u003c\/a\u003e and \u003ca href=\"\/collections\/positive-input-ventilation-piv\"\u003ePIV units\u003c\/a\u003e for the alternatives.\u003c\/p\u003e\n\n\u003ch3\u003eDoes a central MEV unit meet Building Regulations Part F?\u003c\/h3\u003e\n\u003cp\u003eYes. Continuous mechanical extract is one of the ventilation systems recognised in Approved Document F, often referred to as System 3. For a continuous system, Approved Document F sets minimum high extract rates of 13 l\/s for a kitchen, 8 l\/s for a bathroom or utility room and 6 l\/s for a WC, plus a whole dwelling rate based on the number of bedrooms. The Vent-Axia Multivent and Sentinel units are listed in the SAP Product Characteristics Database, and the Greenwood CMEV.4eHT has a Specific Fan Power of 0.16 W\/l\/s, which helps with Part L and SAP calculations.\u003c\/p\u003e\n\n\u003ch3\u003eHow many rooms can one Multivent serve?\u003c\/h3\u003e\n\u003cp\u003eThe Vent-Axia MVDC-MS and MVDC-MSH have three 125mm extract spigots, and the Greenwood CMEV.4E and CMEV.4eHT have five. A typical three or four bedroom house with a kitchen, bathroom, en suite and utility room sits comfortably on one unit. Extra rooms can be picked up with branch fittings as long as the total extract rate stays within the unit's capacity. For larger homes the Sentinel Multivent Plus HX extracts up to 159 l\/s. Send us the room list and we will check it.\u003c\/p\u003e\n\n\u003ch3\u003eVent-Axia Multivent or Greenwood CMEV?\u003c\/h3\u003e\n\u003cp\u003eBoth are proven whole-house MEV units with low energy DC motors. The Vent-Axia Lo-Carbon Multivent is the long-established choice, with three spigots and simple switched-live boost and purge control, and the Sentinel models add finer demand control and, on the Plus HX, app and wireless control. The Greenwood CMEV.4E is very compact, has five spigots and is a drop-in replacement for the older Greenwood Centair and CML units. The CMEV.4eHT adds humidity and timer control and a 0 to 10 V input for BMS. If you are replacing an existing unit, matching the brand usually means the ducting lines up without changes.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need a model with a humidity sensor?\u003c\/h3\u003e\n\u003cp\u003eIt is worth it in most homes. A basic unit runs at its set trickle speed and only boosts when a switched live, usually a light switch, tells it to. A humidity model such as the MVDC-MSH, the Sentinel Multivent Humidity, the Sentinel Multivent Plus HX or the Greenwood CMEV.4eHT boosts automatically when a shower or cooking raises humidity, so condensation is cleared even when nobody remembers to switch anything on. Use the Humidity Control button below to see those models.\u003c\/p\u003e\n\n\u003ch3\u003eWhat ducting does a central extract unit need?\u003c\/h3\u003e\n\u003cp\u003eUse 125mm (5 inch) rigid ducting for the main runs, because smooth solid duct has far less resistance than flexible hose and keeps the unit quiet and efficient. Keep flexible duct to short final connections only. Insulate any duct running through a cold loft so warm, moist air does not condense inside it and run back into the unit, and fit a single discharge duct to a roof or wall terminal. Each room needs an extract valve or grille at the ceiling so the airflow can be balanced during commissioning.\u003c\/p\u003e\n\n\u003ch3\u003eHow much does a Multivent cost to run?\u003c\/h3\u003e\n\u003cp\u003eVery little, because it runs on a DC motor at low speed most of the time. Vent-Axia puts the running cost of the Lo-Carbon Sentinel Multivent at around £15 a year, and the Greenwood CMEV.4eHT and Sentinel Multivent Plus HX have a Specific Fan Power as low as 0.16 W\/l\/s. A single central unit also uses less energy than several individual extractor fans running separately.\u003c\/p\u003e\n\n\u003ch3\u003eCan I replace an old Greenwood Centair or Vent-Axia unit?\u003c\/h3\u003e\n\u003cp\u003eYes. The Greenwood CMEV.4E is designed as a drop-in replacement for the Greenwood Centair and CML, so it fits the existing duct layout. Older Vent-Axia Multivent units can be replaced with the current Lo-Carbon MVDC-MS or MVDC-MSH. Send us the model on the label of the existing unit and we will confirm the right replacement.\u003c\/p\u003e\n\n\u003ch3\u003eDo you supply MEV units for trade and housing projects?\u003c\/h3\u003e\n\u003cp\u003eYes. We supply electricians, M\u0026amp;E contractors, developers and housing providers, and hold stock across the Vent-Axia and Greenwood ranges for next working day delivery. Send a schedule or plot list and we will price the units, ducting and valves together. 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 rel=\"nofollow\" data-tag=\"brand_vent-axia\" href=\"\/collections\/multivent-systems\/brand_vent-axia\"\u003eVent-Axia\u003c\/a\u003e\n\u003ca rel=\"nofollow\" data-tag=\"brand_greenwood\" href=\"\/collections\/multivent-systems\/brand_greenwood\"\u003eGreenwood\u003c\/a\u003e\n\u003ca rel=\"nofollow\" data-tag=\"humidity-control\" href=\"\/collections\/multivent-systems\/humidity-control\"\u003eHumidity Control\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cscript\u003e\n(function(){var n=document.getElementById('efans-subnav');if(!n)return;var base='\/collections\/multivent-systems';\nvar p=location.pathname.replace(\/\\\/$\/,''),seg=p.indexOf(base+'\/')===0?decodeURIComponent(p.slice(base.length+1)):'';\nvar cur=seg?seg.split('+').filter(Boolean):[];\nfunction url(list){return list.length?base+'\/'+list.join('+'):base;}\nn.querySelectorAll('a[data-tag]').forEach(function(a){var t=a.getAttribute('data-tag'),g=t.split('_')[0],on=cur.indexOf(t)\u003e-1;\na.setAttribute('href',url(on?cur.filter(function(x){return x!==t;}):cur.filter(function(x){return x.split('_')[0]!==g;}).concat([t])));\nif(on){a.classList.add('efx-active');a.setAttribute('aria-pressed','true');a.title='Remove this filter';}});})();\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a Multivent extractor fan?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Multivent is Vent-Axia's name for its central mechanical extract ventilation (MEV) units, and it has become the everyday term for any multi vent extractor fan of this type. Instead of a fan in every room, one unit with several extract spigots is ducted to each wet room and runs continuously at a low trickle speed, boosting when a room is in use or humidity rises. The stale air is discharged through a single duct to outside. Greenwood's equivalent is the CMEV central ventilation unit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"MEV, MVHR or PIV: what is the difference?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MEV extracts only. It pulls moist air out of the wet rooms and replacement air comes in through trickle vents in the windows, so there is no supply ducting and no heat recovery. MVHR extracts and supplies through two duct networks and recovers heat from the outgoing air, which makes it the better choice for airtight new builds but a much bigger installation. PIV pushes filtered air in from the loft rather than extracting. For a house with trickle vents where you want every wet room covered by one quiet unit, MEV is usually the simplest and cheapest compliant option. See our whole house MVHR and PIV units for the alternatives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does a central MEV unit meet Building Regulations Part F?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Continuous mechanical extract is one of the ventilation systems recognised in Approved Document F, often referred to as System 3. For a continuous system, Approved Document F sets minimum high extract rates of 13 l\/s for a kitchen, 8 l\/s for a bathroom or utility room and 6 l\/s for a WC, plus a whole dwelling rate based on the number of bedrooms. The Vent-Axia Multivent and Sentinel units are listed in the SAP Product Characteristics Database, and the Greenwood CMEV.4eHT has a Specific Fan Power of 0.16 W\/l\/s, which helps with Part L and SAP calculations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many rooms can one Multivent serve?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Vent-Axia MVDC-MS and MVDC-MSH have three 125mm extract spigots, and the Greenwood CMEV.4E and CMEV.4eHT have five. A typical three or four bedroom house with a kitchen, bathroom, en suite and utility room sits comfortably on one unit. Extra rooms can be picked up with branch fittings as long as the total extract rate stays within the unit's capacity. For larger homes the Sentinel Multivent Plus HX extracts up to 159 l\/s. Send us the room list and we will check it.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Vent-Axia Multivent or Greenwood CMEV?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both are proven whole-house MEV units with low energy DC motors. The Vent-Axia Lo-Carbon Multivent is the long-established choice, with three spigots and simple switched-live boost and purge control, and the Sentinel models add finer demand control and, on the Plus HX, app and wireless control. The Greenwood CMEV.4E is very compact, has five spigots and is a drop-in replacement for the older Greenwood Centair and CML units. The CMEV.4eHT adds humidity and timer control and a 0 to 10 V input for BMS. If you are replacing an existing unit, matching the brand usually means the ducting lines up without changes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a model with a humidity sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It is worth it in most homes. A basic unit runs at its set trickle speed and only boosts when a switched live, usually a light switch, tells it to. A humidity model such as the MVDC-MSH, the Sentinel Multivent Humidity, the Sentinel Multivent Plus HX or the Greenwood CMEV.4eHT boosts automatically when a shower or cooking raises humidity, so condensation is cleared even when nobody remembers to switch anything on. Use the Humidity Control button below to see those models.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What ducting does a central extract unit need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use 125mm (5 inch) rigid ducting for the main runs, because smooth solid duct has far less resistance than flexible hose and keeps the unit quiet and efficient. Keep flexible duct to short final connections only. Insulate any duct running through a cold loft so warm, moist air does not condense inside it and run back into the unit, and fit a single discharge duct to a roof or wall terminal. Each room needs an extract valve or grille at the ceiling so the airflow can be balanced during commissioning.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much does a Multivent cost to run?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Very little, because it runs on a DC motor at low speed most of the time. Vent-Axia puts the running cost of the Lo-Carbon Sentinel Multivent at around £15 a year, and the Greenwood CMEV.4eHT and Sentinel Multivent Plus HX have a Specific Fan Power as low as 0.16 W\/l\/s. A single central unit also uses less energy than several individual extractor fans running separately.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I replace an old Greenwood Centair or Vent-Axia unit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The Greenwood CMEV.4E is designed as a drop-in replacement for the Greenwood Centair and CML, so it fits the existing duct layout. Older Vent-Axia Multivent units can be replaced with the current Lo-Carbon MVDC-MS or MVDC-MSH. Send us the model on the label of the existing unit and we will confirm the right replacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do you supply MEV units for trade and housing projects?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. We supply electricians, M\u0026E contractors, developers and housing providers, and hold stock across the Vent-Axia and Greenwood ranges for next working day delivery. Send a schedule or plot list and we will price the units, ducting and valves together. Call 0161 399 3825 or email hello@efans.co.uk.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n","products":[{"product_id":"vent-axia-lo-carbon-sentinel-multivent-humidity-445655b","title":"Vent-Axia Lo-Carbon Sentinel Multivent Humidity 445655B","description":"\u003cp\u003eThe Vent-Axia Lo-Carbon Sentinel Multivent Humidity (445655B) is a continuous Mechanical Extract Ventilation (MEV) unit designed for the simultaneous ventilation of separate areas in the home or as a multi-point commercial extract system. It offers advanced control options with easier installation and commissioning.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDemand control — precise ventilation rate set in 1% increments based on property size\u003c\/li\u003e\n\u003cli\u003eIntegral LCD display for selecting low, normal and boost speeds\u003c\/li\u003e\n\u003cli\u003eAdjustable overrun and delay-on timer; plug-and-play sensor detection\u003c\/li\u003e\n\u003cli\u003eDry Out setting runs on boost for one week to remove moisture\u003c\/li\u003e\n\u003cli\u003eEnergy-efficient EC\/DC motors — a third less energy lost to heat than AC\u003c\/li\u003e\n\u003cli\u003eLow Specific Fan Power; around £15 a year to run\u003c\/li\u003e\n\u003cli\u003eSwitched-live and SELV connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation with humidity demand control\u003c\/li\u003e\n\u003cli\u003eMulti-point commercial extract systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eCan be installed at any angle; condensate drains are provided where the ambient air has high humidity. Should be installed by a competent person.\u003c\/p\u003e","brand":"Vent-Axia","offers":[{"title":"Default Title","offer_id":36307646873756,"sku":"445655B","price":513.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/vent-axia-lo-carbon-sentinel-multivent-humidity-445655B.jpg?v=1759227498"},{"product_id":"vent-axia-multivent-lo-carbon-mvdc-ms-extractor-fan-437634c","title":"Vent Axia Multivent Lo-Carbon MVDC-MS Extractor Fan 437634C","description":"\u003cp\u003eThe Vent-Axia Multivent Lo-Carbon MVDC-MS (437634C) is a continuous Mechanical Extract Ventilation (MEV) unit designed for the simultaneous ventilation of separate areas in the home, or as a multi-point extractor for commercial applications. With a DC motor it is one of the most efficient central extract units available, offering \"Close Control\" of ventilation rates.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRecognised in SAP PCDB with best-in-class Specific Fan Power\u003c\/li\u003e\n\u003cli\u003eThree 125 mm extract spigots for quick duct connection\u003c\/li\u003e\n\u003cli\u003eComplies with Building Regulations ADF (System 3)\u003c\/li\u003e\n\u003cli\u003eFully variable normal, purge and boost speeds\u003c\/li\u003e\n\u003cli\u003eTwo switched-live connections; improved controllability\u003c\/li\u003e\n\u003cli\u003eAcoustic lining as standard for ultra-quiet running\u003c\/li\u003e\n\u003cli\u003eWall, ceiling or loft mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation\u003c\/li\u003e\n\u003cli\u003eMulti-point commercial extract systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWall, ceiling or loft mounting at any angle. A switched live can select boost speed when wired through an isolator relay (Part No. 442030, not supplied); a second switched live selects purge. Should be installed by a competent person.\u003c\/p\u003e","brand":"Vent-Axia","offers":[{"title":"Default Title","offer_id":36355402432668,"sku":"437634C","price":253.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/vent-axia-437634c.jpg?v=1728411229"},{"product_id":"greenwood-cmev-4e-central-ventilation-unit","title":"Greenwood CMEV.4E Central Ventilation Unit","description":"\u003cp\u003eThe Greenwood CMEV.4E is one of our most popular central Mechanical Extract Ventilation (MEV) solutions — a modern update of the Greenwood Centair\/CML offering improved energy efficiency, performance and noise, and a drop-in replacement for anyone upgrading an older unit. It is a low-energy, continuously running whole-house extract unit using the latest low-energy DC motors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLow-energy DC motor for continuous whole-house extraction\u003c\/li\u003e\n\u003cli\u003eVery compact for discreet cupboard or loft mounting\u003c\/li\u003e\n\u003cli\u003eFive staggered round extraction spigots\u003c\/li\u003e\n\u003cli\u003eDrop-in replacement for Greenwood Centair\/CML\u003c\/li\u003e\n\u003cli\u003eSingle exhaust duct to outside\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation\u003c\/li\u003e\n\u003cli\u003eUpgrading an older central extract unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eCentrally mounted in a cupboard or loft. 125 mm (5\") solid ducting is recommended to minimise air resistance. Should be installed by a competent person.\u003c\/p\u003e","brand":"Greenwood","offers":[{"title":"Default Title","offer_id":36967168934044,"sku":"CMEV.4E","price":226.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/cmev-500x500_500x_44665820-cc26-4acd-9276-42c1520b23aa.jpg?v=1606228686"},{"product_id":"greenwood-cmev-4eht-humidity-timer-central-ventilation-unit","title":"Greenwood CMEV.4eHT Humidity \u0026 Timer Central Ventilation Unit","description":"\u003cp\u003eThe Greenwood CMEV.4eHT Humidity \u0026amp; Timer Central Ventilation Unit is a compact central Mechanical Extract Ventilation (MEV) unit designed for better, easier specification of ventilation in new properties. An exceptionally low Specific Fan Power and compact size give low running costs and space-saving installation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHumidiSMART, continuously monitors humidity and boosts on a genuine spike\u003c\/li\u003e\n\u003cli\u003eTimerSMART, allocates a suitable overrun based on occupancy, cutting nuisance noise and over-ventilation\u003c\/li\u003e\n\u003cli\u003eSpecific Fan Power of just 0.16 W\/l\/s\u003c\/li\u003e\n\u003cli\u003eFive 125 mm extract spigots; single exhaust duct to outside\u003c\/li\u003e\n\u003cli\u003e100% variable-speed DC motors for precise commissioning\u003c\/li\u003e\n\u003cli\u003eBMS capability, 0 to 10 V input and volt-free contact boost\u003c\/li\u003e\n\u003cli\u003eCompact, light and versatile, wall, ceiling or floor mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation in new properties\u003c\/li\u003e\n\u003cli\u003eProjects needing humidity, timer or BMS control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eVersatile wall, ceiling or floor mounting. 125 mm (5\") solid ducting is recommended to minimise air resistance. Should be installed by a competent person.\u003c\/p\u003e","brand":"Greenwood","offers":[{"title":"Default Title","offer_id":37552586915996,"sku":"CMEV.4EHT","price":333.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/greenwood-CMEV4eHT.jpg?v=1611148309"},{"product_id":"vent-axia-lo-carbon-multivent-humidity-mvdc-msh-443298b","title":"Vent-Axia Lo-Carbon Multivent Humidity MVDC-MSH 443298B","description":"\u003cp\u003eThe Vent-Axia Lo-Carbon Multivent MVDC-MSH (443298B) is a continuous Mechanical Extract Ventilation (MEV) unit with an integral humidity sensor. It quietly ventilates the whole home, automatically boosting when humidity rises, and its DC motor makes it one of the most efficient central extract units available.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntegral humidistat and built-in humidity sensor\u003c\/li\u003e\n\u003cli\u003eRecognised in SAP PCDB with best-in-class Specific Fan Power\u003c\/li\u003e\n\u003cli\u003eThree 125 mm extract spigots for quick duct connection\u003c\/li\u003e\n\u003cli\u003eComplies with Building Regulations ADF (System 3)\u003c\/li\u003e\n\u003cli\u003eThree fully variable speeds — normal, boost and purge — with digital display\u003c\/li\u003e\n\u003cli\u003eTwo switched-live connections; ultra-quiet running\u003c\/li\u003e\n\u003cli\u003eWall, ceiling or loft mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation with automatic humidity control\u003c\/li\u003e\n\u003cli\u003eMulti-point commercial extract systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWall, ceiling or loft mounting at any angle. The digital display lets installers set the airflow accurately; the unit boosts automatically when humidity reaches the set threshold. Should be installed by a competent person.\u003c\/p\u003e","brand":"Vent-Axia","offers":[{"title":"Default Title","offer_id":37769078767772,"sku":"443298B","price":298.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/products\/Vent-AxiaLo-CarbonMultiventHumidityMVDC-MSH443298B.jpg?v=1681481286"},{"product_id":"vent-axia-sentinel-multivent-plus-hx-mev-495362","title":"Vent-Axia Sentinel Multivent Plus HX MEV 495362","description":"\u003cp\u003eThe Vent-Axia Sentinel Multivent Plus HX (495362) is a high-performance continuous Mechanical Extract Ventilation (MEV) unit with a built-in humidity sensor and app control. It ventilates the whole home from a central location, boosting automatically when humidity rises, with a very low Specific Fan Power of just 0.16 W\/l\/s.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt-in humidity sensor for automatic boost\u003c\/li\u003e\n\u003cli\u003eApp control; pairs with wireless controllers and sensors\u003c\/li\u003e\n\u003cli\u003eFour fully variable speeds — low, normal, boost and purge\u003c\/li\u003e\n\u003cli\u003eExtracts up to 159 l\/s\u003c\/li\u003e\n\u003cli\u003eSpecific Fan Power as low as 0.16 W\/l\/s\u003c\/li\u003e\n\u003cli\u003eRecognised in SAP PCDB; complies with Building Regulations ADF and ADL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhole-house continuous ventilation for larger homes\u003c\/li\u003e\n\u003cli\u003eHomes wanting app and wireless control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eCentral mounting at any angle with 125 mm ducting. The digital display lets you set the airflow accurately; the unit boosts automatically on rising humidity. Should be installed by a competent person.\u003c\/p\u003e","brand":"Vent-Axia","offers":[{"title":"Default Title","offer_id":45564529606977,"sku":"495362","price":748.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/vent-axia-sentinel-multivent_hx.jpg?v=1689004963"}],"url":"https:\/\/www.efans.co.uk\/collections\/multivent-systems\/humidity-control.oembed","provider":"eFans Direct Ltd","version":"1.0","type":"link"}