---
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: "A$45"
currency: AUD
in_stock: true
reviews_count: 13
category: "Neverest"
url: https://www.desertcart.com.au/products/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized
store_origin: AU
region: Australia
---

# Rubber sealing ensures silent operation Stainless steel springs for automatic closing Galvanized steel housing for durability neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts

**Brand:** neverest
**Price:** A$45
**Availability:** ✅ In Stock

## Summary

> 🌬️ Seal in comfort, shut out the noise — ventilation perfected.

## 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?** A$45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/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

- • **Smart Airflow Control:** Automatic backdraft damper blocks unwanted cold or warm air, optimizing your indoor climate effortlessly.
- • **Robust & Reliable Build:** Galvanized steel and aluminum blades engineered for long-lasting ventilation performance.
- • **Versatile Compatibility:** Fits all standard 100mm metal ducts and flexible pipes, perfect for HVAC, whole-house ventilation, and heat recovery systems.
- • **Whisper-Quiet Operation:** Rubber sealing and precision springs guarantee noiseless opening and closing—no more disruptive clatter.
- • **Easy Installation & Maintenance:** Lightweight 140g design with expert-backed support ensures a hassle-free upgrade to your ventilation setup.

## Overview

The neverest® RK 4 inch Backdraft Shutter is a premium galvanized steel ducting connector designed exclusively for metal ducts. Featuring aluminum damper blades, stainless steel springs, and a rubber sealing ring, it ensures automatic, silent closure to prevent backflow of air. Ideal for HVAC, whole-house ventilation, and heat recovery systems, this 100mm duct fitting combines durability with quiet efficiency, backed by over 40 years of ventilation expertise.

## Description

Shop neverest® RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts. Free delivery on eligible orders of £20 or more.

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
Review: Quiet operation - Great product have tried numerous different products and this seems to work best for me

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 59,953 in DIY & Tools ( See Top 100 in DIY & Tools ) 255 in Registers, Grilles & Vents |
| Colour | Silver |
| Customer Reviews | 4.3 4.3 out of 5 stars (2,011) |
| Date First Available | 28 Aug. 2015 |
| Item Package Quantity | 1 |
| Item Weight | 140 g |
| Manufacturer | neverest |
| Manufacturer reference | 40545030039031 |
| Material | Alloy Steel, Rubber, Stainless Steel |
| Number of Pieces | 1 |
| Part Number | 40545030039031 |
| Product Dimensions | 57 x 52 x 40 cm; 140 g |
| Size | 100mm |

## 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)

## 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

### ⭐⭐⭐⭐⭐ 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

### ⭐⭐⭐⭐⭐ Quiet operation
*by G***N on 9 January 2025*

Great product have tried numerous different products and this seems to work best for me

### ⭐⭐⭐⭐ 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.com.au/products/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized](https://www.desertcart.com.au/products/50008731-neverest-rk-4-inch-backdraft-shutter-100mm-ducting-connector-galvanized)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-03*