{"product_id":"pipe-check-valve-air-duct-draft-blocker-ventilation","title":"Pipe Check Valve | Air Duct Draft Blocker 80–200mm","description":"\n\u003ch2\u003ePipe Check Valve – Air Duct Ventilation Draft Blocker\u003c\/h2\u003e\n\u003cp\u003eKeep your ventilation system working efficiently with this durable plastic \u003cstrong\u003ePipe Check Valve\u003c\/strong\u003e. Designed to allow airflow in one direction only, it prevents backdrafts, unwanted odors, and cold air from traveling back through your ductwork. Ideal for bathroom fans, kitchen exhausts, HVAC ducts, and other round ventilation pipes.\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 Gate-style flap opens with positive airflow and closes automatically when airflow stops, blocking reverse drafts effectively.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Size Options:\u003c\/strong\u003e Available in 80mm, 100mm, 110mm, 150mm, and 200mm diameters to fit a wide range of standard ventilation pipes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Construction:\u003c\/strong\u003e Made from high-quality, lightweight plastic that resists moisture and everyday wear for long-lasting performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRound Shape \u0026amp; Gate Structure:\u003c\/strong\u003e Smooth round profile ensures a secure, flush fit inside standard circular air ducts with minimal airflow restriction.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Simple push-in or snap-fit design — no special tools required. Portable and easy to remove or reposition as needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Suitable for bathroom extractor fans, kitchen range hoods, dryer vents, HRV\/ERV systems, and general HVAC ductwork.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStructure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGate\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 \/ 150mm \/ 200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAs shown in product images\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\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Pipe Check Valve (size as selected)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Due to varying monitor settings and lighting conditions, the actual color may differ slightly from images. Please allow ±1–2 cm measurement tolerance due to manual measuring.\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\/ancient-nutrition-multi-collagen-advanced-muscle-60-capsules\"\u003eAncient Nutrition Multi Collagen Advanced Muscle 60 Capsules\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/womens-denim-vest-jacket-sleeveless-jean-waistcoat\"\u003eWomen's Denim Vest Jacket – Sleeveless Jean Waistcoat S–5XL\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 sizes does this pipe check valve come in?\u003c\/h4\u003e\n\u003cp\u003eA: This air duct check valve is available in five standard diameters: 80mm, 100mm, 110mm, 150mm, and 200mm, making it compatible with most common residential and commercial ventilation duct sizes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How does the pipe check valve work?\u003c\/h4\u003e\n\u003cp\u003eA: The check valve uses a gate-style flap mechanism. When your fan or ventilation system is running, the airflow pushes the flap open to allow air out. When the system stops, the flap falls closed under its own weight, preventing backdrafts, cold air ingress, and odors from returning through the duct.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this check valve suitable for outdoor use or damp environments?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The plastic construction is moisture-resistant, making it suitable for use in humid environments such as bathrooms, kitchens, and utility rooms where condensation may be present in the ductwork.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I install the pipe check valve?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is straightforward — simply insert the check valve into your existing round duct pipe. It is designed for a secure push-in or snap fit with no special tools required. Ensure you select the correct diameter to match your duct pipe for a proper seal.\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 sizes does this pipe check valve come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This air duct check valve is available in five standard diameters: 80mm, 100mm, 110mm, 150mm, and 200mm, making it compatible with most common residential and commercial ventilation duct sizes.\"}}, {\"@type\": \"Question\", \"name\": \"How does the pipe check valve work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The check valve uses a gate-style flap mechanism. When your fan or ventilation system is running, the airflow pushes the flap open to allow air out. 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