{"product_id":"pvc-backdraft-damper-check-valve-80-150mm-one-way-draft-blocker","title":"PVC Backdraft Damper Check Valve 80–150mm | One-Way Draft Blocker","description":"\u003ch2\u003ePVC Round Backdraft Damper \u0026amp; One-Way Check Valve (80–150mm)\u003c\/h2\u003e\n\u003cp\u003eKeep your home's air flowing in the right direction with this heavy-duty \u003cstrong\u003ePVC Round Backdraft Damper\u003c\/strong\u003e. Designed for bathroom and kitchen ventilation fans, this one-way check valve prevents reverse airflow, stops unwanted drafts from entering your living space, and acts as a barrier against insects and mosquitoes sneaking in through your air duct. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOne-Way Airflow Control:\u003c\/strong\u003e Allows air to exit freely while blocking reverse flow and backdrafts from outside.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsect \u0026amp; Mosquito Barrier:\u003c\/strong\u003e The flap seal prevents pests from entering through ventilation ducts when the fan is not running.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Size Options:\u003c\/strong\u003e Available in 80mm, 100mm, 110mm, 125mm, and 150mm to fit a wide range of standard PVC round ducts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable PVC Construction:\u003c\/strong\u003e Lightweight yet sturdy material that resists moisture, making it ideal for bathroom and kitchen environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Drop-In Installation:\u003c\/strong\u003e Simply insert into your existing round duct pipe — no special tools required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Compatible with bathroom exhaust fans, kitchen range hood ducts, HVAC vents, and general household ventilation systems.\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\u003eAvailable Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80mm \/ 100mm \/ 110mm \/ 125mm \/ 150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne-Way Backdraft Damper \/ Check Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBathroom \u0026amp; Kitchen Ventilation Fans, Air Ducts\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 Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × PVC Air Duct Check Valve (Backdraft Damper)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Please allow 0–1 cm tolerance due to manual measurement. Colors may vary slightly between monitors and actual product.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eLooking for More Home Improvement Essentials?\u003c\/h3\u003e\n\u003cp\u003eCheck out these related products from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/balashov-2500w-handheld-steam-cleaner-kitchen-car-home\"\u003eBALASHOV 2500W Handheld Steam Cleaner – Kitchen, Car \u0026amp; Home\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/large-capacity-pencil-pen-bag-zipper-fabric-stationery-organizer\"\u003eLarge Capacity Pencil Pen Bag – Zipper Fabric Stationery Organizer\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes does this PVC backdraft damper check valve come in?\u003c\/h4\u003e\n\u003cp\u003eA: This one-way PVC check valve is available in five standard sizes: 80mm, 100mm, 110mm, 125mm, and 150mm. Be sure to measure your existing round duct pipe diameter before ordering to ensure the correct fit.\u003c\/p\u003e\n\u003ch4\u003eQ: How does a backdraft damper check valve work?\u003c\/h4\u003e\n\u003cp\u003eA: A backdraft damper uses a lightweight flap mechanism that opens when your ventilation fan is running, allowing air to flow outward. When the fan is off, the flap closes under its own weight, preventing outside air, drafts, and insects from entering back through the duct — keeping your indoor environment clean and comfortable.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this check valve suitable for both bathroom and kitchen ventilation fans?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This PVC round backdraft damper is designed for use with standard bathroom exhaust fans and kitchen range hood ventilation ducts. Its moisture-resistant PVC material makes it durable in high-humidity environments like bathrooms and kitchens.\u003c\/p\u003e\n\u003ch4\u003eQ: Is installation difficult?\u003c\/h4\u003e\n\u003cp\u003eA: Not at all. This damper is designed for straightforward drop-in installation into a standard round PVC duct pipe. No special tools are required — simply select the correct size and insert it into your existing ventilation duct.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes does this PVC backdraft damper check valve come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This one-way PVC check valve is available in five standard sizes: 80mm, 100mm, 110mm, 125mm, and 150mm. 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