{"title":"Deflection Grilles - Single \u0026 Double","description":"\u003cp\u003eDeflection grilles are used to control the direction of supply and extract air at the point where ductwork meets the occupied space. Adjustable aluminium blades let you direct airflow horizontally or vertically depending on how the grille is oriented — making them a standard fitting in offices, schools, retail spaces and residential properties with ducted ventilation systems.\u003c\/p\u003e\n\u003cp\u003eOur \u003ca href=\"https:\/\/www.efans.co.uk\/products\/single-deflection-grille?srsltid=AfmBOooI96cE3CLWTb3Vy_CH2saKmEfZNxnXS8swWs0H4Q_6RzYdsRXY\"\u003esingle deflection grilles\u003c\/a\u003e offer 80% maximum free area, keeping pressure drop low and helping your system run efficiently. Available in 10 standard square sizes from 150mm to 600mm with next day delivery. If you need a bespoke size, RAL colour, or a \u003ca href=\"https:\/\/www.efans.co.uk\/products\/double-deflection-grille?srsltid=AfmBOorbjMw19xuK3wQ6hV3oHOoR0mUNSY3R8RzXdYIsm0pRJL288h6P\"\u003edouble deflection grille\u003c\/a\u003e, get in touch and our team will come back with a free quote.\u003c\/p\u003e\n\u003ch2\u003eWhat is a deflection grille?\u003c\/h2\u003e\n\u003cp\u003eA deflection grille is an air terminal device fitted to the end of a duct run to direct the flow of supply or extract air into a room. The angled blades can be adjusted to control the throw and spread of the airstream. They are commonly used in commercial and residential HVAC systems wherever directional control of airflow is needed.\u003c\/p\u003e\n\u003ch2\u003eWhat is the difference between a single and double deflection grille?\u003c\/h2\u003e\n\u003cp\u003eA single deflection grille has one row of adjustable blades, giving you control over airflow direction in one plane. A double deflection grille adds a second row of blades running at 90° to the first, so you can independently adjust both horizontal and vertical airflow. Single deflection is usually sufficient for standard ceiling or wall-mounted supply and return air. Double deflection is the better choice when you need precise control over where the air lands in the room.\u003c\/p\u003e\n\u003ch2\u003eWhat sizes do your deflection grilles come in?\u003c\/h2\u003e\n\u003cp\u003eWe stock 10 standard square sizes: 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, and 600mm. If you need a non-standard size or rectangular format, we can supply custom-made grilles to your exact dimensions.\u003c\/p\u003e\n\u003ch2\u003eCan I get a deflection grille in a custom colour?\u003c\/h2\u003e\n\u003cp\u003eYes. Our standard finish is mill aluminium, but we can supply any grille in a RAL colour of your choice. Contact us with your size and RAL code and we'll provide a quote.\u003c\/p\u003e\n\u003ch2\u003eWhere are deflection grilles used?\u003c\/h2\u003e\n\u003cp\u003eDeflection grilles are designed for internal use on ducted ventilation systems. Typical applications include ceiling-mounted supply air in offices and commercial buildings, wall-mounted return air grilles, and supply outlets in residential ducted heating or cooling systems. For external applications, see our weather louvres range instead.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhen should I use a double deflection grille instead of a single deflection grille?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUse a double deflection grille when you need precise airflow control in both horizontal and vertical directions. They’re ideal for offices, classrooms, retail spaces, and large commercial areas where air must be evenly distributed or directed away from occupants. Single deflection grilles are best for simpler supply or return air applications with minimal throw requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eCan deflection grilles be used for both supply and extract air?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. Deflection grilles work effectively for both supply and extract systems. On supply air, adjustable blades help shape and control airflow distribution. On extract air, they provide a clean, professional finish while allowing limited adjustment where needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eDo deflection grilles affect airflow performance?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAbsolutely. The grille design directly impacts airflow throw, spread, and pressure drop. High free-area options improve efficiency by reducing resistance, while adjustable blades allow for precise air direction and better comfort control.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eAre aluminium deflection grilles suitable for commercial environments?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. Aluminium deflection grilles are widely used in offices, schools, retail units, and public buildings. They offer a strong blend of durability, corrosion resistance, and lightweight installation, with a sleek finish that fits modern commercial interiors.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eHow do I choose the correct size deflection grille?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSelect a grille size that matches your duct opening and required airflow rate. Larger grilles handle higher air volumes and lower face velocities, helping to minimise noise and maintain balanced system performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","products":[{"product_id":"single-deflection-grille","title":"Single Deflection Grille","description":"\u003cp class=\"p1\"\u003eDesigned to help control the direction of airflow in internal ventilation systems. With one row of adjustable blades, it allows air to be directed where it’s needed, making it suitable for both supply and extract applications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eMade from durable aluminium, it offers a clean and professional finish while remaining lightweight and easy to install. Available in a range of sizes and finishes, this grille provides a straightforward and reliable solution for managing airflow in both residential and commercial spaces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e80% Maximum Free Area\u003c\/li\u003e\n\u003cli\u003eInternal use\u003c\/li\u003e\n\u003cli\u003eAvailable in 10 standard sizes\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eCustomise in any size or RAL colour\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"eFans","offers":[{"title":"150mm x 150mm","offer_id":56067585638779,"sku":"SD150","price":26.1,"currency_code":"GBP","in_stock":true},{"title":"200mm x 200mm","offer_id":56067585671547,"sku":"SD200","price":28.42,"currency_code":"GBP","in_stock":true},{"title":"250mm x 250mm","offer_id":56067585704315,"sku":"SD250","price":32.74,"currency_code":"GBP","in_stock":true},{"title":"300mm x 300mm","offer_id":56067585737083,"sku":"SD300","price":36.62,"currency_code":"GBP","in_stock":true},{"title":"350mm x 350mm","offer_id":56067585769851,"sku":"SD350","price":39.07,"currency_code":"GBP","in_stock":true},{"title":"400mm x 400mm","offer_id":56067585802619,"sku":"SD400","price":43.7,"currency_code":"GBP","in_stock":true},{"title":"450mm x 450mm","offer_id":56067585835387,"sku":"SD450","price":48.5,"currency_code":"GBP","in_stock":true},{"title":"500mm x 500mm","offer_id":56067585868155,"sku":"SD500","price":107.74,"currency_code":"GBP","in_stock":true},{"title":"550mm x 550mm","offer_id":56067585900923,"sku":"SD550","price":67.99,"currency_code":"GBP","in_stock":true},{"title":"600mm x 600mm","offer_id":56067585933691,"sku":"SD600","price":73.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/SD_front_3981c43b-7c81-410f-9fe7-51b934e1a535.png?v=1773403310"},{"product_id":"double-deflection-grille","title":"Double Deflection Grille","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDesigned to provide precise control over the direction of airflow in internal ventilation systems. With two rows of independently adjustable blades set at 90° to each other, it allows air to be directed both horizontally and vertically — giving you full control over throw and spread. Suitable for both supply and extract applications where accurate air distribution matters.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eMade from durable aluminium, it offers a clean and professional finish while remaining lightweight and easy to install. Available in a range of sizes and finishes, this grille is the ideal choice for managing airflow in offices, retail spaces, schools and other commercial and residential buildings.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e80% Maximum Free Area\u003c\/li\u003e\n\u003cli\u003eInternal use\u003c\/li\u003e\n\u003cli\u003eAvailable in 10 standard sizes\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eCustomise in any size or RAL colour\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"eFans","offers":[{"title":"150mm x 150mm","offer_id":56173012189563,"sku":"DD150","price":26.1,"currency_code":"GBP","in_stock":true},{"title":"200mm x 200mm","offer_id":56173012222331,"sku":"DD200","price":28.42,"currency_code":"GBP","in_stock":true},{"title":"250mm x 250mm","offer_id":56173012255099,"sku":"DD250","price":32.74,"currency_code":"GBP","in_stock":true},{"title":"300mm x 300mm","offer_id":56173012287867,"sku":"DD300","price":36.62,"currency_code":"GBP","in_stock":true},{"title":"350mm x 350mm","offer_id":56173012320635,"sku":"DD350","price":39.07,"currency_code":"GBP","in_stock":true},{"title":"400mm x 400mm","offer_id":56173012353403,"sku":"DD400","price":43.7,"currency_code":"GBP","in_stock":true},{"title":"450mm x 450mm","offer_id":56173012386171,"sku":"DD450","price":48.5,"currency_code":"GBP","in_stock":true},{"title":"500mm x 500mm","offer_id":56173012418939,"sku":"DD500","price":58.99,"currency_code":"GBP","in_stock":true},{"title":"550mm x 550mm","offer_id":56173012451707,"sku":"DD550","price":67.99,"currency_code":"GBP","in_stock":true},{"title":"600mm x 600mm","offer_id":56173012484475,"sku":"DD600","price":73.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0355\/3932\/0965\/files\/DD_front_a153c0dd-ef3e-44b0-a39f-c96c784d76e5.png?v=1773403310"}],"url":"https:\/\/www.efans.co.uk\/collections\/deflection-grilles.oembed","provider":"eFans Direct Ltd","version":"1.0","type":"link"}