{"product_id":"pvc-round-backdraft-damper-check-valve-bathroom-kitchen-ventilation","title":"PVC Round Backdraft Damper Check Valve – Kitchen \u0026 Bathroom","description":"\n\u003ch2\u003eRound PVC Backdraft Damper \u0026amp; Air Duct Check Valve\u003c\/h2\u003e\n\u003cp\u003eKeep your kitchen and bathroom air clean and odor-free with this durable \u003cstrong\u003eRound PVC Backdraft Damper Check Valve\u003c\/strong\u003e. Designed for range hood exhaust systems, bathroom ventilation fans, and air duct setups, this one-way check valve prevents unwanted backflow of air, odors, and gases — ensuring fresh, controlled airflow through your ventilation system at all times.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're upgrading your range hood, bathroom exhaust fan, or public flue system, this electricity-free, pneumatically operated valve opens when air flows through and seals shut automatically when airflow stops. Simple, reliable, and maintenance-free.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-quality PVC plastic — lightweight, durable, and corrosion-resistant\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOne-Way Valve Design:\u003c\/strong\u003e Prevents backflow of odors, smoke, and gases into living spaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectricity-Free Operation:\u003c\/strong\u003e Pneumatically powered — no wiring or batteries needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble-Ended Anti-Odor Check:\u003c\/strong\u003e Extra defense against odor and smoke intrusion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open Structure:\u003c\/strong\u003e Opens with airflow, seals automatically when fan is off\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard Temperature Compatible:\u003c\/strong\u003e Suitable for normal operating temperatures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Ideal for range hoods, bathroom ventilation fans, kitchen flues, wall duct fans, and public flue systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTwo Installation Methods\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle A:\u003c\/strong\u003e Double-ended connection for PVC pipe with outer diameter of 110mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle B:\u003c\/strong\u003e Double-ended connection for aluminum foil tube with inner diameter of 80\/100mm\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\u003ePVC Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectricity-Free (Pneumatic)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eValve Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne-Way Check Valve (Normally Open)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Media\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGas \/ Air\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStyle A Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePVC Pipe, Outer Diameter 110mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStyle B Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum Foil Tube, Inner Diameter 80\/100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in 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\u003e1x Flue Smoke Control Check Valve (No Other Accessories Included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Colors may vary slightly between monitors. Manual measurements may have a 1–3 cm tolerance — please account for this when ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-broom-handle-grip-sleeve-22mm-high-elasticity-nonslip-plastic-mop-stick-replacement-end-cap-for-home-cleaning-universal\"\u003e10pcs Broom Handle Grip Sleeve – Nonslip Plastic Mop Stick Replacement End Cap\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/100pcs-rubber-pourer-cap-winte-bottle-pour-spout-cover-pour-spouts-caps-bottles-rubber-caps-pourers-dust-covers-caps\"\u003e100pcs Rubber Pourer Cap – Bottle Pour Spout Dust Cover Caps\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1000d-tactical-edc-bag-military-ammo-pouch-hunting-wash-bag-dump-pouch-portable-tool-storage-handbag-compatible-military-utility\"\u003e1000D Tactical EDC Bag – Portable Tool Storage Handbag\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a backdraft damper check valve and how does it work?\u003c\/h4\u003e\n\u003cp\u003eA: A backdraft damper check valve is a one-way airflow control device installed in ventilation ducts. It allows air to flow in one direction (outward, through your exhaust fan) and automatically closes when the fan is off, preventing outside air, odors, or gases from flowing back into your home. This PVC round check valve operates pneumatically — no electricity required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What pipe sizes is this check valve compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This check valve offers two installation styles: Style A connects to PVC pipes with an outer diameter of 110mm, while Style B connects to aluminum foil tubes with an inner diameter of 80mm or 100mm. Please measure your existing ductwork before purchasing to ensure compatibility.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Where can this PVC backdraft damper be installed?\u003c\/h4\u003e\n\u003cp\u003eA: This versatile check valve is suitable for a wide range of ventilation applications including kitchen range hood exhaust systems, bathroom ventilation fans, toilet wall duct fans, and public or shared flue systems. It's designed to work at normal ambient temperatures and is ideal for residential and light commercial use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this check valve require any electrical connection?\u003c\/h4\u003e\n\u003cp\u003eA: No — this check valve is completely electricity-free. It operates using the pneumatic force of airflow from your exhaust fan, opening automatically when the fan runs and closing when it stops. No wiring, batteries, or smart controls are needed.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a backdraft damper check valve and how does it work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A backdraft damper check valve is a one-way airflow control device installed in ventilation ducts. 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