---
product_id: 91224614
title: "neverest® RK 4\" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts"
brand: "neverest"
price: "₨714"
currency: SCR
in_stock: true
reviews_count: 13
category: "Neverest"
url: https://www.desertcart.sc/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct-fits
store_origin: SC
region: Seychelles
---

# Opens with minimal air pressure Operates from 14°F to 140°F Galvanized steel & aluminum build neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts

**Brand:** neverest
**Price:** ₨714
**Availability:** ✅ In Stock

## Summary

> 🚀 Seal out drafts, seal in comfort — the pro’s choice for flawless airflow!

## Quick Answers

- **What is this?** neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts by neverest
- **How much does it cost?** ₨714 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/91224614-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct-fits)

## 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 Operation:** Internal foam strip and smooth spring mechanism eliminate rattling for a peaceful environment.
- • **Premium Durability:** Galvanized steel body with aluminum flaps ensures long-lasting, rust-resistant performance.
- • **Quick & Easy Installation:** Designed for metal ducts with simple insertion and optimal spring positioning—get it up and running in under an hour.
- • **Effortless Airflow Control:** Backdraft damper opens automatically at low air volumes, preventing unwanted drafts with zero hassle.
- • **Versatile HVAC Compatibility:** Perfectly engineered for ACs, dryers, exhausts, range hoods, and heating ducts—your all-in-one ventilation solution.

## Overview

The neverest® RK 4" Professional Backdraft Shutter Damper is a high-quality ventilation accessory crafted from galvanized steel and aluminum. It automatically prevents backflow of air and wind through metal ducts, operating efficiently between 14°F and 140°F. Designed for seamless integration with HVAC systems including air conditioners, dryers, and exhaust vents, it features a silent, spring-loaded flap that opens with minimal air pressure. Easy to install and built to last, this damper ensures optimal airflow control and energy efficiency in professional and home environments.

## Description

Buy neverest® RK 4" Professional 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 Quality- Worked For City Code Inspection Requirement For Outdoor Commerical Dryer - Good Quality- Worked for City Code Inspection Requirement for outdoor Commerical Dryer. Install straight forward with arrows as directed for flow / operation of ducting flapper. Installed with very short sheet metal screws to prevent lint build up inside ducting. Can be installed with hose clamps if non city code requirement.

## 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 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #90,223 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #147 in HVAC Ducting |
| Brand | neverest |
| Color | Silver |
| Connector Type | Flange |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,999) |
| Date First Available | July 6, 2016 |
| Exterior Finish | Aluminum |
| Finish | Steel |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 4.9 ounces |
| Item dimensions L x W x H | 22.44 x 20.47 x 15.75 inches |
| Manufacturer | neverest |
| Material | Galvanized Steel |
| Number of Pieces | 1 |
| Part Number | 40545030039031 |
| Product Dimensions | 22.44 x 20.47 x 15.75 inches |
| Size | 4 Inch |
| Thread Type | CW |
| Usage | Use in air conditioners (AC), dryers, exhaust, extractor or range hoods, heating ducts, vents, and other HVAC applications. |
| Warranty Description | 2 years |

## Product Details

- **Brand:** neverest
- **Color:** Silver
- **Connector Type:** Flange
- **Exterior Finish:** Aluminum
- **Item Weight:** 140 Grams
- **Item dimensions L x W x H:** 22.44 x 20.47 x 15.75 inches
- **Material:** Galvanized Steel
- **Number of Pieces:** 1
- **Size:** 4 Inch
- **Thread Type:** CW

## Images

![neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts - Image 1](https://m.media-amazon.com/images/I/61R-zDPpQKL.jpg)

## Available Options

This product comes in different **Size** options.

## 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 Quality- Worked For City Code Inspection Requirement For Outdoor Commerical Dryer
*by D***R on May 20, 2025*

Good Quality- Worked for City Code Inspection Requirement for outdoor Commerical Dryer. Install straight forward with arrows as directed for flow / operation of ducting flapper. Installed with very short sheet metal screws to prevent lint build up inside ducting. Can be installed with hose clamps if non city code requirement.

### ⭐⭐⭐⭐⭐ I am thrilled!
*by A***I on February 8, 2024*

I had two vents that were banging very loudly when it was a windy day. My vent for the hood over my stove was 5" and the other vent (from my dryer) was 4". So, I am glad I purchased both sizes. Don't assume you know the size. Anyways, these work GREAT. I do have a plastic cover that hides them from the outside, but all of that terrible banging has stopped. Occasionally, I will hear them open and close, but they are much quieter due to the rubber seal inside. Great product and builders really need to install these instead of those loud clanging plastic ones! Thank you for a great product!!

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-02-27*