--- product_id: 91224614 title: "neverest® RK 4\" Professional Backdraft Shutter Damper Connector Duct" brand: "neverest" price: "303 kr" currency: NOK in_stock: true reviews_count: 13 category: "Neverest" url: https://www.desertcart.no/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct store_origin: NO region: Norway --- # auto flap with smooth spring operates 14-140°F 4" galvanized steel build neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct **Brand:** neverest **Price:** 303 kr **Availability:** ✅ In Stock ## Summary > 🔧 Keep your airflow flawless and your space comfortable—neverest® has your ducts covered! ## Quick Answers - **What is this?** neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct by neverest - **How much does it cost?** 303 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct) ## 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 - • **Temperature Resilient:** Operates flawlessly from chilly 14°F to warm 140°F, perfect for year-round climate control. - • **Versatile Installation:** Fits both horizontal and vertical metal ducts with easy snap-in setup—no fuss, no tools needed. - • **Precision Auto-Closing Flap:** Smooth-running spring and foam strip eliminate rattling, ensuring silent, efficient airflow control. - • **Multi-Application HVAC Essential:** Ideal for ACs, dryers, exhausts, and range hoods—your all-in-one airflow guardian. - • **Durable Galvanized Steel & Aluminum:** Engineered for longevity and corrosion resistance in demanding HVAC environments. ## Overview The neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct is a robust HVAC accessory crafted from galvanized steel and aluminum. Designed to prevent unwanted air backflow, it features an automatic flap with a smooth spring and foam strip for silent operation. Suitable for metal ducts only, it installs easily in both horizontal and vertical orientations and withstands temperatures from 14 to 140°F, making it a versatile solution for air conditioners, dryers, exhausts, and more. ## Description Buy neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct | Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts: Heater Control Valves - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Neverest® RK 5" is an Excellent duct damper and Works with the slightest amount of air movement. - Excellent duct damper. I order and received a different 5" damper bade by ECOPRO originally but there were two springs on the 5" damper flaps, and it took quite a force to push open the flaps, so I ended up returning that and ordering the Neverest® RK 5" Backdraft Shutter Damper. The damper opens with a minimal amount of pressure and the quality of the unit is great. My issue was that we have a down draft cooktop and when there was a descent amount of wind outside, we would get a flow of cold air (IT was in the early spring) blowing out the downdraft grill on the cooktop, so I needed to prevent the wind draft from blowing into the ducting from outside. I installed the Backdraft Shutter Damper in a 5" metal flexible duct, and it took about 45 minutes from start to finish to complete the job. Now even with the slightest outside breeze the damp shuts and does not allow any draft into the house! Review: Good Product - This product did a good job is helping with the draft. ## Features - ✅ WELL-MADE The 4 inch backdraft damper is made out of a galvanized steel while the flap leaves are made of aluminum. The axis and spring are made of stainless steel, 3.5 inches deep, and can withstand temperatures from 14 to 140 °F. The backflow damper prevents the ingress of cold or warm air and wind from entering through the ventilation duct. - ✅ FEATURES The backflow flap opens and closes automatically at low air volumes. It has a smooth-running spring and an internal foam strip to keep the blades from rattling and can be installed horizontally or vertically. - ✅ MULTIPLE USE Designed for use in air conditioners (AC), dryers, exhaust, extractor or range hoods, heating ducts, vents, and other HVAC applications. - ✅ EASY INSTALLATION The backflow flap is installed by inserting it into the ventilation pipe until it stops. The position of the spring should be horizontal for horizontal installations so that it can open and close optimally. The backdraft shutter is installed so that the damper blades open only in the outflowing air direction. - ✅ NOTE Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Please note that this is to be installed in metal ducts only. Measure the diameter of your duct before purchasing. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B011INHF5A | | Best Sellers Rank | #57,256 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #88 in HVAC Ducting | | Brand | neverest | | Brand Name | neverest | | Color | Silver | | Connector Type | Flange | | Customer Reviews | 4.5 out of 5 stars 2,084 Reviews | | Exterior Finish | Aluminum | | Item Dimensions | 22.44 x 20.47 x 15.75 inches | | Item Highlight | Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts | | Item Weight | 140 g | | Item dimensions L x W x H | 22.44 x 20.47 x 15.75 inches | | Manufacturer | neverest | | Manufacturer Part Number | 40545030039031 | | Manufacturer Warranty Description | 2 years | | Material | Galvanized Steel | | Material Type | Galvanized Steel | | Number of Packs | 1 | | Number of Pieces | 1 | | Size | 100 mm | | Thread Type | CW | | Unit Count | 1 Count | ## Product Details - **Brand:** neverest - **Color:** Silver - **Connector Type:** Flange - **Exterior Finish:** Aluminum - **Item Weight:** 140 g - **Item dimensions L x W x H:** 22.44 x 20.47 x 15.75 inches - **Material:** Galvanized Steel - **Number of Pieces:** 1 - **Size:** 100 mm - **Thread Type:** CW ## Images ![neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct - Image 1](https://m.media-amazon.com/images/I/61R-zDPpQKL.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 ### ⭐⭐⭐⭐⭐ Neverest® RK 5" is an Excellent duct damper and Works with the slightest amount of air movement. *by E***F on April 15, 2025* Excellent duct damper. I order and received a different 5" damper bade by ECOPRO originally but there were two springs on the 5" damper flaps, and it took quite a force to push open the flaps, so I ended up returning that and ordering the Neverest® RK 5" Backdraft Shutter Damper. The damper opens with a minimal amount of pressure and the quality of the unit is great. My issue was that we have a down draft cooktop and when there was a descent amount of wind outside, we would get a flow of cold air (IT was in the early spring) blowing out the downdraft grill on the cooktop, so I needed to prevent the wind draft from blowing into the ducting from outside. I installed the Backdraft Shutter Damper in a 5" metal flexible duct, and it took about 45 minutes from start to finish to complete the job. Now even with the slightest outside breeze the damp shuts and does not allow any draft into the house! ### ⭐⭐⭐⭐⭐ Good Product *by W***E on December 27, 2025* This product did a good job is helping with the draft. ### ⭐⭐⭐⭐ Trim shaft, weaken spring first *by J***. on December 18, 2021* Shaft sticks out about 1/16 ea side of insert, so I had to trim flush since the fit is skin tight inside standard vent duct on a mobile home rent trailer. I should have weakened the spring before installing since full power fan struggles to open against spring pressure even AFTER ensuring gaps taped with flashing tape. I should have used Hardcast tape ( gooey alum) since I didn't thoroughly clean the area there. The regular stuff isn't stuck well, but I'm thinking the fan motor is due for retirement. It's been getting louder last couple years, and took it out,cleaning w/oil spa didn't do any noticeable good. Sure it works, but it's noisy and underrated and im sure next renter would rather not have a jank hood motor hollarin all thru din. No sense in half measures ol W.W. right about a lot of stuff xsept his biz model one of many others none ive known ended well in that genre. Anyway, hope u learned at least trim the shaft flush to fit inside duct and cavity needs sealed good if the motor has any chance of opening the check against the spring. I'd weaken the spring if I could groundhog day it, but for now ima order another motor since I'm looking for a top shelf tenant in this turd box and that means minimal janky noises or fixes that look daf. It's a nice turd box tho so i put in air fry oven, bidets, bt showerhead. WM fire sale'd at $10/ea so i see it as cheap turd polish loaded the cart Got back and one tenant lit up big smile 😀 bidet!!yay! Totally worth and still 20 of each in my truck. Trailer park Santa feeling warm n fuzzy except wearing old denim bibs and muddy boots. Proper attire all things considered. ## 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.no/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct](https://www.desertcart.no/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-10-06*