--- product_id: 367016281 title: "Repa Market 4 Inch (100mm) Backdraft Damper/Galvanized Steel Draft Blocker/One-Way Airflow Stopper/HVAC Exhaust Duct Connector/Inline Spring-Loaded Backflow Preventer for Secure Ventilation" brand: "repa market" price: "£14.70" currency: GBP in_stock: true url: https://www.desertcart.co.uk/products/367016281-repa-market-4-inch-100mm-backdraft-damper-galvanized-steel-draft store_origin: GB region: United Kingdom --- # Fits standard 4-inch ducts precisely Spring-loaded one-way airflow control Durable galvanized steel for long-lasting protection Repa Market 4 Inch (100mm) Backdraft Damper/Galvanized Steel Draft Blocker/One-Way Airflow Stopper/HVAC Exhaust Duct Connector/Inline Spring-Loaded Backflow Preventer for Secure Ventilation **Brand:** repa market **Price:** £14.70 **Availability:** ✅ In Stock ## Summary > 🛠️ Stop drafts, save energy, and breathe easy with Repa Market’s backdraft damper! ## Quick Answers - **What is this?** Repa Market 4 Inch (100mm) Backdraft Damper/Galvanized Steel Draft Blocker/One-Way Airflow Stopper/HVAC Exhaust Duct Connector/Inline Spring-Loaded Backflow Preventer for Secure Ventilation by repa market - **How much does it cost?** £14.70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/367016281-repa-market-4-inch-100mm-backdraft-damper-galvanized-steel-draft) ## Best For - repa market enthusiasts ## Why This Product - Trusted repa market brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile HVAC Compatibility:** Perfect for dryers, range hoods, bathroom vents, and more—compatible with rigid and flexible ducting. - • **Quick & Hassle-Free Installation:** Simply insert horizontally into metal ducts—no tools or expertise required for a secure seal. - • **Effortless One-Way Airflow Control:** Spring-loaded flaps automatically prevent backdrafts, keeping your space fresh and energy-efficient. - • **Built to Last with Heavy-Duty Steel:** Galvanized steel construction resists corrosion, heat, and wear for reliable, quiet operation. - • **Precision Fit for Seamless Integration:** Engineered to snugly fit Ø4 inch (100mm) ducts, ensuring airtight, leak-free performance. ## Overview The Repa Market 4 Inch Backdraft Damper is a precision-engineered, galvanized steel inline ventilation accessory designed to prevent reverse airflow in HVAC systems. Featuring spring-loaded flaps for automatic one-way airflow control, it fits standard 4-inch ducts and installs easily for durable, quiet, and efficient ventilation in both residential and commercial settings. ## Description Full description not available ## Features - DIMENSIONS – Fits Ø4 Inch (100mm) round ducts; Insertion diameter: 3.89 inch (99mm). Total width: 3.46 Inch (88mm). Precision-engineered for a tight internal fit inside metal ventilation pipes for reliable, airtight performance. - AUTOMATIC BACKDRAFT CONTROL – 4 Inch inline draft stopper features spring-loaded flaps that open only in the outflow direction, stopping reverse airflow, cold air, odors, and unwanted drafts while keeping HVAC duct systems efficient and quiet. - DURABLE GALVANIZED STEEL – Heavy-duty galvanized steel backflow damper with smooth spring action, prevents rattling and air leakage. Built to withstand high temperatures, moisture, and continuous use in dryer vents, kitchen exhausts, HVAC ductwork, and heating systems. - EASY INSTALLATION – Simply insert the draft blocker into round ducting until the stop edge; fits Ø4 Inch metal ventilation pipes for a secure seal. INSTALLED ONLY HORIZONTALLY for optimal one-way airflow in your duct system. - WIDE HVAC APPLICATIONS – Designed as a backdraft shutter for air conditioners, dryers, cooker hoods, bathroom exhausts, inline ventilation fans, range hoods, and heating ducts. Works with rigid or flexible metal ducting and spiral pipe connectors, ensuring efficient backflow prevention in residential and commercial ventilation. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Repa Market | | Product Dimensions | 10.5 x 10.5 x 9.7 cm; 130 g | | Size | Ø4" Inch | | Colour | Silver | | Finish | Galvanized | | Material | Galvanized Steel | | Shape | Circular | | Item Package Quantity | 1 | | Number of Pieces | 1 | | Special Features | Easy to Install | | Usage | Commercial/Residential | | Included Components | Backdraft Damper | | Batteries included? | No | | Batteries Required? | No | | Item Weight | 130 g | ## Product Details - **Colour:** Silver - **Material:** Galvanized Steel - **Brand:** Repa Market - **Product dimensions:** 8.8L x 8.8W x 1Th centimetres - **Maximum gap fill:** 4 Inches ## Images ![Repa Market 4 Inch (100mm) Backdraft Damper/Galvanized Steel Draft Blocker/One-Way Airflow Stopper/HVAC Exhaust Duct Connector/Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 1](https://m.media-amazon.com/images/I/71PnvUBtxOL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - Draft Blocker 4'' Inch - Backdraft Damper - Draft Stopper - Backflow Preventer - Inline Fan Vent Deflector - One-Way Airflow Ducting - Dryer Duct Connector with Backdraught Flap - EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm) - 4'' Inch Duct Splitter for Exhaust Fan Dryer Vent Hose 3 Way Duct Hose Connector, Y Shape, Y Joint Metal (4'' Inch, Y Shape) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/367016281-repa-market-4-inch-100mm-backdraft-damper-galvanized-steel-draft](https://www.desertcart.co.uk/products/367016281-repa-market-4-inch-100mm-backdraft-damper-galvanized-steel-draft) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-15*