{"product_id":"back-draft-shutter-ducting-part","title":"Back Draft Shutter Ducting Part","description":"\u003csection class=\"gh-product-listing\"\u003e\n\u003ch2\u003eBack Draft Shutter Ducting Part — Anti-Backflow Damper for Extraction Systems\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers wanting odour containment and airflow protection when extraction fans are off\u003c\/p\u003e\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003eThis does exactly what it should — stops air flowing the wrong way when your fan's off, without creating a fuss about it. Simple, reliable, and the kind of thing that sits quietly in the background until you actually need it. Worth having in place.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eA back draft shutter is a ducting component that prevents air from entering or leaving your grow space when your extraction system is inactive. Fitted inline between your duct fan and outlet, it uses spring-loaded damper blades that open when air is being extracted, then close automatically the moment the fan stops. In short: no backflow, no escaped odours, no stress during power outages or equipment failures.\u003c\/p\u003e\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eBack draft shutters sit at the foundation of proper odour control and system protection.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpring-loaded damper design opens freely under normal airflow, with negligible impact on CFM\u003c\/li\u003e\n\u003cli\u003eMore reliable than gravity flaps, which can rattle or fail to seal properly\u003c\/li\u003e\n\u003cli\u003eSignificantly cheaper than integrated connector units, allowing you to retrofit existing ducting\u003c\/li\u003e\n\u003cli\u003eQuieter operation than basic flap designs — no knocking or banging in wind\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou're getting a critical safety component at a price that makes sense for any extraction setup.\u003c\/p\u003e\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward and works across most ducting types:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation position\u003c\/strong\u003e\u003cbr\u003eMount the shutter near the outlet point of your extraction system, facing the direction of airflow. Can be fitted horizontally or vertically without performance loss.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConnection to flexi ducting\u003c\/strong\u003e\u003cbr\u003eSlide the shutter into your existing flexi duct and secure with a duct clip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConnection to rigid ducting\u003c\/strong\u003e\u003cbr\u003eFit to rigid duct using a female-to-female coupling, then seal the joint with aluminium duct tape.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMulti-fan setups\u003c\/strong\u003e\u003cbr\u003eParticularly useful in dual-fan systems with air-cooled fixtures. The shutter prevents air from being drawn backwards through cooling loops when your primary fan stops, while allowing your carbon filter fan to continue running independently.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmergency protection\u003c\/strong\u003e\u003cbr\u003eDuring power outages or scheduled maintenance, the shutter automatically seals your grow space. Combined with a carbon filter, this gives you an extra layer of odour containment when extraction isn't running.\u003c\/p\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesign: Spring-loaded damper blades (butterfly configuration)\u003c\/li\u003e\n\u003cli\u003eMaterial: Galvanised steel body with spring-loaded aluminium damper blades\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: 4\", 5\", 6\", 8\", 10\" \u0026amp; 12\" (100mm to 300mm ducting)\u003c\/li\u003e\n\u003cli\u003ePressure drop: Approximately 15 PA (negligible impact on fan performance)\u003c\/li\u003e\n\u003cli\u003eBuild standard: EU manufacturing standard with quality welds and sealed joints\u003c\/li\u003e\n\u003cli\u003eOrientation: Can be mounted horizontally or vertically\u003c\/li\u003e\n\u003cli\u003eInstallation: Compatible with flexi and rigid ducting via standard duct clips or female-to-female couplings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAny grower running an extraction system with carbon filtration\u003c\/li\u003e\n\u003cli\u003eResidential growers in multi-storey properties where odour containment matters\u003c\/li\u003e\n\u003cli\u003eGrowers upgrading basic setups with proper passive airflow protection\u003c\/li\u003e\n\u003cli\u003eSetups using air-cooled fixtures where dual-fan systems need backflow prevention\u003c\/li\u003e\n\u003cli\u003eAnyone planning for worst-case scenarios (power outages, equipment failure, maintenance downtime)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eParticularly suited to growers who want to eliminate the risk of untreated air escaping during system downtime without overcomplicating things.\u003c\/p\u003e\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThis is proper odour control infrastructure at a realistic price. It's not flashy, but that's the point — it sits in your ducting doing its job invisibly until the moment you actually need it. When your fan's off and air tries to backflow, it just closes. Simple.\u003c\/p\u003e\n\u003cp\u003eIf you're running extraction with a carbon filter and don't have backflow protection in place, good time to add one while clearance stock lasts. The kind of component that costs very little but saves you properly when things go wrong.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"METAL DUCTING","offers":[{"title":"4\"","offer_id":47916270092458,"sku":"83192","price":8.99,"currency_code":"GBP","in_stock":false},{"title":"5\"","offer_id":47916270125226,"sku":"83202","price":10.99,"currency_code":"GBP","in_stock":false},{"title":"6\"","offer_id":47916270157994,"sku":"83212","price":12.99,"currency_code":"GBP","in_stock":false},{"title":"8\"","offer_id":47916270190762,"sku":"83222","price":17.99,"currency_code":"GBP","in_stock":true},{"title":"10\"","offer_id":47916270223530,"sku":"83232","price":28.99,"currency_code":"GBP","in_stock":false},{"title":"12\"","offer_id":47916270256298,"sku":"83233","price":35.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/main_17.jpg?v=1769190371","url":"https:\/\/growershouse.co.uk\/products\/back-draft-shutter-ducting-part","provider":"Growers House ","version":"1.0","type":"link"}