---
product_id: 409695865
title: "neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts"
brand: "neverest"
price: "$80.43"
currency: USD
in_stock: true
url: https://www.desertcart.ec/products/409695865-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized
store_origin: EC
region: Ecuador
---

# Automatic backdraft shutter with stainless steel springs Rubber sealing ensures 100% quiet, airtight closure 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:** $80.43
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your airflow game with neverest® – where durability meets silent precision!

## 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?** $80.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/409695865-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

- • **Built to Last:** Galvanized steel and aluminum blades deliver unmatched robustness for your ventilation system.
- • **Versatile Fit:** Designed exclusively for metal ducts, compatible with all common 100mm round ventilation pipes.
- • **Trusted Expertise:** Backed by 40+ years of ventilation mastery, ensuring reliable performance and easy installation.
- • **Whisper-Quiet Seal:** Rubber ring guarantees silent operation and perfect airtightness—no more noisy ducts.
- • **Smart Airflow Control:** Automatic shutter opens with exhaust airflow and closes instantly to block unwanted drafts.

## Overview

The neverest® RK 4 inch Backdraft Shutter is a premium galvanized steel ducting connector featuring aluminum damper blades and stainless steel springs for automatic, silent closure. Designed exclusively for metal ducts with 100mm diameter, it prevents unwanted air backflow while ensuring quiet, airtight sealing. Ideal for HVAC, ventilation, and heat recovery systems, this robust component is backed by over 40 years of industry expertise.

## Description

neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts

## 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 |
|---------------|-------|
| Product Dimensions | 57 x 52 x 40 cm; 140 g |
| Item Weight | 140 Grams |
| Number of pieces | 1 |
| Batteries required | No |

## Product Details

- **Size:** 100mm
- **Material:** Steel, galvanized
- **Brand:** neverest
- **Colour:** Silver
- **Item dimensions L x W x H:** 57 x 52 x 40 centimeters

## 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)

## 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

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.ec/products/409695865-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized](https://www.desertcart.ec/products/409695865-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized)

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-20*