{"product_id":"round-pipe-check-valve-air-duct-draft-blocker-exhaust-fan","title":"Round Pipe Check Valve – Air Duct Draft Blocker for Exhaust Fans","description":"\n\u003ch2\u003eRound Pipe Check Valve – Reliable Air Duct Ventilation Control\u003c\/h2\u003e\n\u003cp\u003eKeep your kitchen, bathroom, or utility room properly ventilated with this \u003cstrong\u003eRound Plastic Pipe Check Valve\u003c\/strong\u003e. Designed to fit standard round air ducts and exhaust fan hoses, this durable one-way valve allows air to flow freely in the desired direction while preventing backflow, drafts, and odors from re-entering your living space. A simple yet essential upgrade for any ventilation system.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in China.\u003c\/strong\u003e\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 exhaust air to exit freely while blocking reverse airflow, odors, and drafts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Construction:\u003c\/strong\u003e Made from high-quality, lightweight plastic built to withstand everyday ventilation use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRound Pipe Design:\u003c\/strong\u003e Fits standard round air duct hoses — ideal for kitchen range hoods, bathroom exhaust fans, and HVAC vents\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Battery or Wiring Required:\u003c\/strong\u003e Completely passive operation — no electricity, no maintenance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Simply connect inline with your existing exhaust duct — no tools needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo High-Concern Chemicals:\u003c\/strong\u003e Manufactured without hazardous chemical components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Round Pipe Check Valve (One-Way Draft Blocker)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e As shown in product images\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e As shown in product images\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Required:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWireless:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e 1 x Round Pipe Check Valve\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eKitchen exhaust fans and range hoods\u003c\/li\u003e\n  \u003cli\u003eBathroom ventilation systems\u003c\/li\u003e\n  \u003cli\u003eLaundry room dryer duct lines\u003c\/li\u003e\n  \u003cli\u003eHVAC and air duct systems requiring backflow prevention\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Due to monitor settings and lighting conditions, the actual color may vary slightly from what is shown in photos. Please allow 1–2 cm measurement deviation due to manual measurement.\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 more information on home ventilation best practices, visit the U.S. Environmental Protection Agency – Ventilation and Air Quality in Homes.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does a round pipe check valve do in an exhaust fan system?\u003c\/h4\u003e\n\u003cp\u003eA: A round pipe check valve acts as a one-way gate in your air duct. It opens when your exhaust fan is running to let air out, and automatically closes when the fan is off to prevent outside air, drafts, and odors from flowing back into your home.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What size air duct does this check valve fit?\u003c\/h4\u003e\n\u003cp\u003eA: This valve is designed for standard round air duct hoses. Please refer to the product images for exact dimensions, and measure your existing duct diameter before purchasing to ensure a proper fit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this check valve suitable for kitchen range hood installations?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This round pipe check valve is an excellent addition to kitchen range hood exhaust ducts, bathroom fans, laundry dryer vents, and other standard ventilation systems where backflow prevention is needed.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this valve require any special tools or wiring to install?\u003c\/h4\u003e\n\u003cp\u003eA: No tools or wiring are required. This is a completely passive mechanical device — simply insert it inline with your existing round air duct hose for immediate backflow protection.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a round pipe check valve do in an exhaust fan system?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A round pipe check valve acts as a one-way gate in your air duct. It opens when your exhaust fan is running to let air out, and automatically closes when the fan is off to prevent outside air, drafts, and odors from flowing back into your home.\"}}, {\"@type\": \"Question\", \"name\": \"What size air duct does this check valve fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This valve is designed for standard round air duct hoses. Please refer to the product images for exact dimensions, and measure your existing duct diameter before purchasing to ensure a proper fit.\"}}, {\"@type\": \"Question\", \"name\": \"Is this check valve suitable for kitchen range hood installations?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! This round pipe check valve is an excellent addition to kitchen range hood exhaust ducts, bathroom fans, laundry dryer vents, and other standard ventilation systems where backflow prevention is needed.\"}}, {\"@type\": \"Question\", \"name\": \"Does this valve require any special tools or wiring to install?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No tools or wiring are required. This is a completely passive mechanical device — simply insert it inline with your existing round air duct hose for immediate backflow protection.\"}}]}\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\": \"Kitchen \u0026 Dining\", \"item\": \"https:\/\/oasis-select.com\/collections\/kitchen-dining\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Round Pipe Check Valve – Air Duct Draft Blocker for Exhaust Fans\", \"item\": \"https:\/\/oasis-select.com\/products\/round-pipe-check-valve-air-duct-draft-blocker-exhaust-fan\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"200mm","offer_id":47748078796905,"sku":"14:200004889#200mm","price":31.86,"currency_code":"USD","in_stock":true},{"title":"150mm","offer_id":47748078829673,"sku":"14:200006154#150mm","price":31.86,"currency_code":"USD","in_stock":true},{"title":"110mm","offer_id":47748078862441,"sku":"14:200006153#110mm","price":31.86,"currency_code":"USD","in_stock":true},{"title":"100mm","offer_id":47748078895209,"sku":"14:200006152#100mm","price":31.86,"currency_code":"USD","in_stock":true},{"title":"80mm","offer_id":47748078927977,"sku":"14:200006151#80mm","price":31.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Sd8238504ae434d8e8a80e48b73215d8fS.webp?v=1783081117","url":"https:\/\/oasis-select.com\/products\/round-pipe-check-valve-air-duct-draft-blocker-exhaust-fan","provider":"Oasis Select","version":"1.0","type":"link"}