{"product_id":"pvc-exhaust-fan-check-valve-backdraft-damper-75-110mm-air-duct","title":"PVC Backdraft Damper Check Valve 75\/110mm | Exhaust Fan Duct","description":"\n\u003ch2\u003ePVC Exhaust Fan Check Valve – Backdraft Damper for Bathroom \u0026amp; Kitchen Ventilation\u003c\/h2\u003e\n\u003cp\u003eKeep your home's air fresh and odor-free with this durable \u003cstrong\u003ePVC Exhaust Fan Check Valve\u003c\/strong\u003e. Designed as a round pipe backdraft damper, it automatically blocks reverse airflow through your ventilation duct — preventing kitchen odors, moisture, and stale air from creeping back into your living space. Compatible with both \u003cstrong\u003e75mm and 110mm PVC pipes\u003c\/strong\u003e as well as 80\/100mm aluminum foil ducts, this versatile valve is the ideal upgrade for range hoods, bathroom exhaust fans, and kitchen ventilation systems.\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\u003eAnti-Backdraft Design:\u003c\/strong\u003e Normally open valve closes automatically when airflow reverses, blocking odors and contaminants from re-entering your space.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectricity-Free Operation:\u003c\/strong\u003e Pneumatically actuated — no wiring, no power source required. Simply installs inline with your existing ductwork.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable PVC Construction:\u003c\/strong\u003e Lightweight yet sturdy PVC material handles normal temperatures and everyday ventilation demands with ease.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5 Flexible Installation Styles:\u003c\/strong\u003e Fits a wide range of duct configurations for maximum compatibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Works with kitchen range hoods, bathroom exhaust fans, and general air duct ventilation grills.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e5 Installation Styles\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle A:\u003c\/strong\u003e Double-ended — connects PVC pipe with outer diameter of 110mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle B:\u003c\/strong\u003e One end outer diameter 110mm PVC pipe; other end inner diameter 80mm or 100mm aluminum foil tube\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle C:\u003c\/strong\u003e Double-ended — connects PVC pipe with outer diameter of 75mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle D:\u003c\/strong\u003e One end outer diameter 75mm PVC pipe; other end inner diameter 80mm or 100mm aluminum foil tube\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle E:\u003c\/strong\u003e Double-ended — connects 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\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Pipe Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e75mm \u0026amp; 110mm OD PVC; 80mm \u0026amp; 100mm ID Aluminum Foil\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperation\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\u003eNormally Open, Check\/Backdraft Damper\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNormal Temperature\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\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1× Check Valve (No other accessories included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Actual product color may vary slightly from images due to monitor differences. Manual measurements may have a ±1–3cm tolerance.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\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  \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\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on home ventilation best practices and indoor air quality, visit the U.S. EPA Indoor Air Quality – Ventilation in Homes resource.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What pipe sizes is this PVC backdraft damper check valve compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This check valve is compatible with 75mm and 110mm outer diameter PVC pipes, as well as 80mm and 100mm inner diameter aluminum foil ducts. Five installation styles (A–E) cover a wide range of duct and pipe configurations, making it suitable for most standard kitchen and bathroom ventilation setups.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this exhaust fan check valve require electricity to operate?\u003c\/h4\u003e\n\u003cp\u003eA: No — this backdraft damper is completely electricity-free. It operates pneumatically, meaning airflow from your exhaust fan opens the valve, and it closes automatically when airflow stops or reverses, preventing odors and outside air from flowing back into your home.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this check valve for both kitchen range hoods and bathroom exhaust fans?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This round pipe check valve is designed for use with kitchen range hoods, bathroom exhaust fans, and general air duct ventilation systems. Its dual pipe-size compatibility (75mm and 110mm) makes it a versatile solution for most residential ventilation needs.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is installation difficult?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is straightforward. The valve includes manual and instruction guidance. Simply select the installation style (A–E) that matches your existing duct configuration and connect accordingly — no special tools or electrical work required.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What pipe sizes is this PVC backdraft damper check valve compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This check valve is compatible with 75mm and 110mm outer diameter PVC pipes, as well as 80mm and 100mm inner diameter aluminum foil ducts. 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