--- product_id: 50008731 title: "neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts" brand: "neverest" price: "£20.61" currency: GBP in_stock: true reviews_count: 13 category: "Neverest" url: https://www.desertcart.co.uk/products/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized store_origin: GB region: United Kingdom --- # Rubber sealing ensures 100% quiet, airtight closure Dual stainless steel springs for automatic, reliable flap action Galvanized steel housing for ultimate durability neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts **Brand:** neverest **Price:** £20.61 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your airflow game with neverest® — where precision meets peace of mind! ## Quick Answers - **What is this?** neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts by neverest - **How much does it cost?** £20.61 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/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized) ## Best For - neverest enthusiasts ## Why This Product - Trusted neverest brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Silent Efficiency:** Rubber sealing combined with precision springs guarantees zero noise and zero backflow—experience peace of mind and comfort. - • **Trusted Expertise:** Backed by 40+ years of ventilation mastery, delivering professional-grade performance that managers and homeowners rely on. - • **Seamless Integration:** Designed exclusively for metal ducts with a perfect 100mm fit, ensuring hassle-free installation and optimal airflow control. - • **Versatile Application:** Ideal for whole-house ventilation, HVAC, heat recovery systems, and more—upgrade your indoor air quality effortlessly. - • **Robust Industrial-Grade Build:** Galvanized steel and aluminum blades engineered for longevity and resilience in demanding ventilation setups. ## Overview The neverest® RK 4 inch Backdraft Shutter is a premium ventilation accessory crafted from galvanized steel and aluminum, featuring dual stainless steel springs and a rubber seal for silent, airtight operation. Designed exclusively for 100mm metal ducts, it prevents unwanted air backflow while enabling smooth exhaust airflow. Perfect for HVAC, whole-house ventilation, and heat recovery systems, this durable shutter combines expert engineering with easy installation to enhance indoor air quality and comfort. ## Description Product Description Neverest - Provides a range of different products, tools and knowledge to help you get the best ventilation solutions. Professional Ventilation Accessories for Optimal Indoor Climate . For your Health, your Well-being and your Performance Neverest's offers a big range of different products with Quality to fit your needs. Neverest's range of products is Effective, Reliable and Safe. Ventilation systems have several advantages - witness your quality of life, your health and happiness improve every day. Application Areas Heating systems and ventilation systems in private households, trade and industry. Smoking areas, residential house ventilation, greenhouses, indoor plant cultivation, restaurants, clubs, offices and garages. Review: Solid build, perfect - Quality build. Spring perfect resistance. Installed into Cooker Exhuast. Fan 1 and the flap open nearly half, But if fan 2or 3 the flap open full. No draft air coming inside at all. Review: Worth the money - Does the job perfectly. Well made and easy to fit. Quiet - no noise opening and closing. Well engineered. Would definitely say worth the money ## Features - EXCELLENT QUALITY The neverest RK 4" ducting with backdraft shutter is very robust and durable. The housing is made of galvanized steel and the damper blades are made of aluminum. Two stainless steel springs are for automatic closing while the rubber ring ensures 100% closure and quiet closing. - PRODUCT FUNCTION The backflow damper blocks the cold and warm air from entering through the ventilation duct. The flaps open when the extractor fan blows out the exhaust air and automatically close as soon as the airflow stops. The flaps must be aligned horizontally in order to close optimally. - MULTIPLE USE This backdraft damper can also be used in whole-house ventilation, passive ventilation, air conditioning hose connector, vent connector, HVAC and Heat Recovery Systems. Fits all common round ventilation pipes and 100mm flexible ducting according to DIN EN 1506. - PERFECT CHOICE Designed for long-lasting ventilation systems perfect for home improvement. Can be used to join multiple lengths of pipe together to form a long duct run or connect directly to a ventilator. - NOTE This is to be installed in metal ducts only. Measure the diameter of your duct before purchasing. We are experts in ventilation for more than 40 years. If you have any questions or complaints, please contact our customer service directly. Your request will be processed immediately. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B011INHF5A | | Best Sellers Rank | 97,799 in DIY & Tools ( See Top 100 in DIY & Tools ) 419 in Registers, Grilles & Vents | | Brand | neverest | | Colour | Silver | | Connector Type | Pipe connector | | Connector type | Pipe connector | | Country of Origin | China | | Customer Reviews | 4.4 out of 5 stars 2,068 Reviews | | Exterior Finish | Aluminium | | Item Dimensions | 57 x 52 x 40 centimetres | | Item Weight | 140 Grams | | Item dimensions L x W x H | 57 x 52 x 40 centimetres | | Manufacturer | neverest | | Material | Alloy Steel, Rubber, Stainless Steel | | Number of Pieces | 1 | | Part Number | 40545030039031 | | Size | 100mm | | Thread Size | 100 | | Thread Type | UN | | Unit Count | 1.0 count | ## Product Details - **Brand:** neverest - **Colour:** Silver - **Connector type:** Pipe connector - **Exterior finish:** Aluminium - **Item dimensions L x W x H:** 57 x 52 x 40 centimetres - **Item weight:** 140 Grams - **Material:** Alloy Steel, Rubber, Stainless Steel - **Size:** 100mm - **Thread size:** 100 - **Thread type:** UN ## Images ![neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts - Image 1](https://m.media-amazon.com/images/I/61R-zDPpQKL.jpg) ![neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts - Image 2](https://m.media-amazon.com/images/I/71OoEpfjNSL.jpg) ![neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts - Image 3](https://m.media-amazon.com/images/I/71U7XuBmmOL.jpg) ![neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts - Image 4](https://m.media-amazon.com/images/I/71WA4lhgp7L.jpg) ![neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts - Image 5](https://m.media-amazon.com/images/I/81dpOxjdMmL.jpg) ## Questions & Answers **Q: Hi, is the 5" made to go on to 5" duct** A: I purchsaed the 4 inch for my clothes dryer exhaust vent to the outside of my house. They are true to size and a 5 inch should fit a 5 inch duct perfectly. This is an excellent addition to either a stove vent or clothes dryer vent. It prevents back draft air from entering the duct and also prevents conditioned air from escaping my house. **Q: Hi - would it be best to put this at the end of the vent (near the outside) or on the house closest to the dryer? My vent is installed in the soffit.** A: Always at the end of the vent where the air exhaust to the outside of your house. You want to keep cold and hot air from being forced into your house on windy days as well as insect and birds from nesting. I have one on my kitchen stove vent on the outside brick wall and on my dryer vent on the side of my house. Before i installed it my laundry room was cold all winter from wibd being forced in. **Q: For my cooktop vent, i have a broken plastic damper i need to replace. this one is 5.5in od, what product would work for this?** A: I,m using a reducer on the top of the vent hood over the cook top from 5 inch vent to 4 inch duct and then i am using the 4 inch pressure activated back draft your referring to on the outside wall with an ordinary clothes dryer rain shield over the opening. The dryer vent pipe cover should have a wind / rain shield incorporated in it. Most dryer vent covers have a plastic door which does not permit a positive closer in windy conditions. I also have the spring loaded damper door on my clothes dryer. These doors are great for preventing blow back into your house when either the cooktop vent or dryer are not in use. **Q: Do u make a 7 inch inline damper?** A: Good Morning, the RK is available in 160mm or 200mm ## Customer Reviews ### ⭐⭐⭐⭐⭐ Solid build, perfect *by R***. on 12 November 2020* Quality build. Spring perfect resistance. Installed into Cooker Exhuast. Fan 1 and the flap open nearly half, But if fan 2or 3 the flap open full. No draft air coming inside at all. ### ⭐⭐⭐⭐⭐ Worth the money *by M***S on 10 August 2020* Does the job perfectly. Well made and easy to fit. Quiet - no noise opening and closing. Well engineered. Would definitely say worth the money ### ⭐⭐⭐⭐ Cheap and effective *by B***R on 8 October 2019* Some have commented that the flaps don't close. I've installed these on three fan / ventilation pipes and they all work fine. I install with the hinge vertically, so the flaps open like doors and close easily. I put them on the exit side of the fan, so the maximum force pushes them open, because in strong winds backdraft can push them shut. ## Frequently Bought Together - neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts - EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm) - QWORK 4" Duct Splitter, 45° Degree 4 Inch Branch Metal Duct Connector 3 Way Hose Adapter/Splitter --- ## 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/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized](https://www.desertcart.co.uk/products/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-30*