{"product_id":"80-200mm-round-ventilation-pipe-check-valve-exhaust-fan-duct-backdraft","title":"80–200mm Ventilation Pipe Check Valve | Exhaust Fan Backdraft Stop","description":"\n\u003ch2\u003e80–200mm Round Ventilation Pipe Check Valve – Backdraft Stopper for Exhaust Fan Ducts\u003c\/h2\u003e\n\u003cp\u003eKeep your home's airflow moving in the right direction with this durable \u003cstrong\u003eround ventilation pipe check valve\u003c\/strong\u003e. Engineered from high-quality ABS plastic, this shutoff valve fits standard duct diameters from 80mm to 200mm, making it a versatile solution for kitchen range hoods, bathroom exhaust fans, HVAC systems, and general ventilation pipe projects. Its clever one-way airflow design lets air flow freely outward while blocking backdraft and preventing odours from creeping back into your space.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium ABS Construction:\u003c\/strong\u003e Durable, lightweight plastic body with a non-oxidising finish ensures long-lasting, corrosion-resistant performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5 Size Options:\u003c\/strong\u003e Available in 80mm (3.14\"), 100mm (3.93\"), 110mm (4.33\"), 150mm (5.90\"), and 200mm (7.87\") to suit a wide range of pipe diameters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBackdraft Prevention:\u003c\/strong\u003e One-way shutoff mechanism allows smooth outward airflow while automatically closing to block reverse airflow, odours, and drafts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool-Free Installation:\u003c\/strong\u003e Simply slide or connect the valve to your existing ventilation pipe — no specialist tools or skills required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Application:\u003c\/strong\u003e Ideal for exhaust fan pipes, kitchen hoods, bathroom ventilation, HVAC ducting, air ducts, and general pipe ventilation projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean White Finish:\u003c\/strong\u003e Neutral white colour blends seamlessly with most duct systems and interior spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes Available\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80mm \/ 100mm \/ 110mm \/ 150mm \/ 200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStructure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eShutoff \/ One-Way Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Ventilation Pipe Check Valve (size of your choice)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Actual colour may vary slightly from images due to monitor brightness settings. Please allow minor measurement tolerances of ±1–2mm.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-inch-threaded-brass-ball-valve-water-gas-oil-flow-control\"\u003e1-Inch Threaded Brass Ball Valve – Water, Gas \u0026amp; Oil Flow Control\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-1-4-inch-adjustable-washbasin-siphon-trap-leak-proof-silicone-seal\"\u003e1-1\/4\" Adjustable Washbasin Siphon Trap | Leak-Proof Silicone\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on indoor ventilation standards and best practices, visit the \u003ca href=\"https:\/\/www.epa.gov\/indoor-air-quality-iaq\/improving-indoor-air-quality\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eU.S. EPA Indoor Air Quality resource page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes does this ventilation pipe check valve come in?\u003c\/h4\u003e\n\u003cp\u003eA: This round check valve is available in five sizes: 80mm (3.14\"), 100mm (3.93\"), 110mm (4.33\"), 150mm (5.90\"), and 200mm (7.87\"). Select the size that matches your existing exhaust fan or ventilation duct diameter for a secure, leak-free fit.\u003c\/p\u003e\n\u003ch4\u003eQ: How does the check valve prevent backdraft and odours?\u003c\/h4\u003e\n\u003cp\u003eA: The valve features a one-way shutoff mechanism — a flap or damper that opens freely when your exhaust fan is running (pushing air outward) and automatically closes when the fan is off, blocking reverse airflow, outside drafts, insects, and odours from re-entering your space through the duct.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this check valve compatible with standard PVC or ABS ventilation pipes?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Made from ABS plastic with standard round dimensions, this check valve is designed to connect easily with most common round ventilation pipes, exhaust fan ducts, and HVAC duct fittings of the corresponding diameter. No adhesive or specialist tools are required for installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this valve be used in both kitchen and bathroom ventilation systems?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This versatile check valve is well-suited for kitchen range hoods, bathroom exhaust fans, laundry room vents, and any other general ventilation ducting application that requires one-way airflow control.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes does this ventilation pipe check valve come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This round check valve is available in five sizes: 80mm (3.14\\\"), 100mm (3.93\\\"), 110mm (4.33\\\"), 150mm (5.90\\\"), and 200mm (7.87\\\"). Select the size that matches your existing exhaust fan or ventilation duct diameter for a secure, leak-free fit.\"}}, {\"@type\": \"Question\", \"name\": \"How does the check valve prevent backdraft and odours?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The valve features a one-way shutoff mechanism — a flap or damper that opens freely when your exhaust fan is running (pushing air outward) and automatically closes when the fan is off, blocking reverse airflow, outside drafts, insects, and odours from re-entering your space through the duct.\"}}, {\"@type\": \"Question\", \"name\": \"Is this check valve compatible with standard PVC or ABS ventilation pipes?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. Made from ABS plastic with standard round dimensions, this check valve is designed to connect easily with most common round ventilation pipes, exhaust fan ducts, and HVAC duct fittings of the corresponding diameter. No adhesive or specialist tools are required for installation.\"}}, {\"@type\": \"Question\", \"name\": \"Can this valve be used in both kitchen and bathroom ventilation systems?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely. This versatile check valve is well-suited for kitchen range hoods, bathroom exhaust fans, laundry room vents, and any other general ventilation ducting application that requires one-way airflow control.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home \u0026 Living\", \"item\": \"https:\/\/oasis-select.com\/collections\/home-living\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"80–200mm Ventilation Pipe Check Valve | Exhaust Fan Backdraft Stop\", \"item\": \"https:\/\/oasis-select.com\/products\/80-200mm-round-ventilation-pipe-check-valve-exhaust-fan-duct-backdraft\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"100MM","offer_id":47748718035049,"sku":"183:201036875#100MM","price":11.15,"currency_code":"USD","in_stock":true},{"title":"110MM","offer_id":47748718067817,"sku":"183:202170825#110MM","price":11.15,"currency_code":"USD","in_stock":true},{"title":"80MM","offer_id":47748718100585,"sku":"183:200982318#80MM","price":11.15,"currency_code":"USD","in_stock":true},{"title":"150MM","offer_id":47748718133353,"sku":"183:202170826#150MM","price":11.15,"currency_code":"USD","in_stock":true},{"title":"200MM","offer_id":47748718166121,"sku":"183:202170827#200MM","price":11.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S1cd0ef1c36a04e48ad959cf3672cf04dZ.webp?v=1783087833","url":"https:\/\/oasis-select.com\/products\/80-200mm-round-ventilation-pipe-check-valve-exhaust-fan-duct-backdraft","provider":"Oasis Select","version":"1.0","type":"link"}