{"product_id":"heavy-duty-4-inch-round-duct-damper-with-snappy-sp","title":"Heavy Duty 4 Inch Round Duct Damper With Snappy Spring Loaded Flap To Kick Ass Cold Drafts And Keep Your Hvac System Running Smooth As Butter Galvanized Steel Construction For Long Lasting Performance On Any Residential Or Commercial Riser Project","description":"\u003cdiv\u003e\n\u003cp\u003eSingle pack 4 inch round hvac damper stops cold drafts fast\u003cbr\u003e✔️ Steel frame snaps shut aluminum blade mounts on 4 inch hvac tubes\u003c\/p\u003e \u003cp\u003eSold as a single heavy duty round duct damper, this inline backdraft valve fits standard residential and commercial hvac risers. It locks out freezing drafts while maintaining smooth airflow across your ventilation grid.\u003c\/p\u003e \u003cp\u003e✅ Snappy spring loaded aluminum flap halts cold air intrusion instantly\u003cbr\u003e✅ Corrosion resistant galvanized steel shell handles moisture and heat\u003cbr\u003e✅ Direct slide fit design aligns cleanly with standard 4 inch round pipes\u003cbr\u003e\u003c\/p\u003e \u003cp\u003e💡 How does a spring loaded hvac damper maintain steady airflow without causing pressure drops?\u003cbr\u003eThis handy inline seal balances immediate draft protection with zero restriction on active exhaust modes.\u003cbr\u003e- The rapid closing speed prevents reverse air circulation that drains heated indoor temperature\u003cbr\u003e- Optimized aerodynamic blade shape reduces turbulence along circular duct runs\u003cbr\u003e- Heavy gauge metal housing absorbs vibration from central furnace motors perfectly\u003cbr\u003e- Easy direct swap design aligns cleanly with standard round ventilation pipes\u003c\/p\u003e✝️\u003c\/div\u003e","brand":"Amazon","offers":[{"title":"Default Title","offer_id":49306277576939,"sku":"VXB07HM64Q2Z","price":103.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/3268\/0683\/files\/51NBXuICawL.jpg?v=1787867247","url":"https:\/\/vxb.com\/products\/heavy-duty-4-inch-round-duct-damper-with-snappy-sp","provider":"VXB Bearings","version":"1.0","type":"link"}