--- product_id: 366297764 title: "4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in)" brand: "dojobkinb" price: "£11.24" currency: GBP in_stock: true reviews_count: 8 category: "Dojobkinb" url: https://www.desertcart.co.uk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one store_origin: GB region: United Kingdom --- # One-way airflow precision Stainless steel spring mechanism Galvanized steel durability 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) **Brand:** dojobkinb **Price:** £11.24 **Availability:** ✅ In Stock ## Summary > 🚫💨 Stop the Backdraft, Start the Comfort! ## Quick Answers - **What is this?** 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) by dojobkinb - **How much does it cost?** £11.24 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/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one) ## Best For - dojobkinb enthusiasts ## Why This Product - Trusted dojobkinb brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Silent Operation Design:** Smooth flap movement with no noise, maintaining a peaceful environment. - • **Maintenance-Free Reliability:** Durable aluminum flaps and stainless steel springs guarantee consistent performance without hassle. - • **Robust Galvanized Steel Build:** Engineered for long-lasting, rust-resistant performance in any ventilation setup. - • **Universal Fit for 4-Inch Ducts:** Effortlessly installs in most residential and commercial ventilation pipes for versatile use. - • **Precision One-Way Airflow Control:** Prevents unwanted backdrafts, ensuring optimal air circulation and energy efficiency. ## Overview This 4-inch backdraft damper features a galvanized steel body, aluminum flaps, and stainless steel spring for durable, silent one-way airflow control. Designed for easy installation in standard ventilation ducts, it effectively prevents air backflow, enhancing HVAC efficiency across residential and commercial applications. ## Description desertcart.com: 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) : Home & Kitchen Review: Easy to install and no noise - Installed this about a year ago, works great and you never hear it. Best part is that it really does stop backdrafts when he wind is blowing. NOTE: my hood came with a bad one with no seal. I ended up having to remove it cause it would still flop around and make noise. Review: Works well when installed in correct direction, LOL! - The product arrived in excellent condition, functioning as expected. While it feels slightly flimsy, it delivers reliable performance. Compared to similar items I considered it offers great value for the price. Overall, it's a worthwhile purchase that balances quality and affordability effectively. I'm satisfied with its performance and condition. Thanks! ## Features - 【Material】The 4 inch backdraft damper is made out of a Galvanized steel, the flap leaves are made of aluminum, while the Axis and spring are made of stainless steel - 【Installation】The backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation - 【Function】This airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use - 【Wide Application】 These backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applications - 【Note】Back draught valves can be inserted into ventilation ducts which are flexible or non flexible. Cannot be used with plastic ducts as the sizes are different ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B099R69LM2 | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #442,137 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,080 in HVAC Ducting | | Customer Reviews | 4.5 4.5 out of 5 stars (149) | | Date First Available | July 19, 2021 | | Item Package Quantity | 1 | | Item Weight | 5 ounces | | Manufacturer | dojobkinb | | Package Dimensions | 5.2 x 4.13 x 3.7 inches | | Size | 4 Inch | ## Images ![4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) - Image 1](https://m.media-amazon.com/images/I/51kULEAgl7L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can this be used for inbound furnace air to keep out bugs and cold when not on?** A: No. It is for dryer vent. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy to install and no noise *by J***R on November 9, 2025* Installed this about a year ago, works great and you never hear it. Best part is that it really does stop backdrafts when he wind is blowing. NOTE: my hood came with a bad one with no seal. I ended up having to remove it cause it would still flop around and make noise. ### ⭐⭐⭐⭐⭐ Works well when installed in correct direction, LOL! *by A***C on March 27, 2025* The product arrived in excellent condition, functioning as expected. While it feels slightly flimsy, it delivers reliable performance. Compared to similar items I considered it offers great value for the price. Overall, it's a worthwhile purchase that balances quality and affordability effectively. I'm satisfied with its performance and condition. Thanks! ### ⭐⭐⭐⭐⭐ Works! *by S***E on February 4, 2026* This seems to work as described. The cold air seeping in through the dryer vent has been significantly reduced. I had to work a bit on the installation because this requires a female fitting on both ends, but a little time with a pair of pliers modified the old elbow enough to make it work. It was WAY cheaper than installing the whole outlet. Overall, it fit and was easy to install. This is what I was looking for. ## Frequently Bought Together - 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) - EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm) - Aluminum Foil Tape, 2 inch x 65 Feet (3.9 mil), Insulation Adhesive Metal High Temperature Heavy Duty HVAC Tape, Silver for Ductwork, Dryer Vent, HVAC --- ## 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/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one](https://www.desertcart.co.uk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-03*