---
product_id: 643949745
title: "neverest® RK 4\" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts"
brand: "neverest"
price: "$157"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/643949745-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct-fits
store_origin: NZ
region: New Zealand
---

# automatic low-volume airflow flap operates from 14°F to 140°F 4-inch galvanized steel build neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts

**Brand:** neverest
**Price:** $157
**Availability:** ✅ In Stock

## Summary

> 🌬️ Keep your airflow flawless—because your space deserves the best!

## 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?** $157 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/643949745-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

- • **Effortless Installation:** Snap-in design fits seamlessly into 4-inch metal ducts for quick setup.
- • **Optimal Airflow Control:** Automatically opens and closes to prevent unwanted drafts and maintain indoor comfort.
- • **Versatile HVAC Compatibility:** Perfect for ACs, dryers, exhausts, and range hoods—your all-in-one airflow guardian.
- • **Durable Galvanized Steel Construction:** Engineered for longevity and corrosion resistance in metal ducts.
- • **Precision Aluminum Flap with Stainless Steel Spring:** Ensures smooth, silent operation without rattling.

## Overview

The neverest® RK 4" Professional Backdraft Shutter Damper Connector is a robust ventilation accessory crafted from galvanized steel with aluminum flaps and stainless steel springs. Designed exclusively for metal ducts, it fits 4-inch pipes and operates efficiently between 14°F and 140°F. Its automatic flap mechanism prevents backflow of air, enhancing HVAC performance while minimizing noise and drafts. Ideal for a variety of ventilation systems, it offers easy installation and reliable durability for professional-grade airflow management.

## Description

neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts

## 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 |
|---------------|-------|
| Size | 4 Inch |
| Material | Galvanized Steel |
| Brand | neverest |
| Colour | Silver |
| Item dimensions L x W x H | 57 x 52 x 40 Centimeters |
| Connector Type | Flange |
| Exterior Finish | Aluminium |
| Thread Type | CW |
| Item Weight | 140 Grams |
| Number of Pieces | 1 |
| Manufacturer | neverest |
| Item part number | 40545030039031 |
| Product Dimensions | 57 x 52 x 40 cm; 140 g |
| ASIN | B011INHF5A |

## Product Details

- **Size:** 4 Inch
- **Material:** Galvanized Steel
- **Brand:** neverest
- **Colour:** Silver
- **Item dimensions L x W x H:** 57 x 52 x 40 Centimeters
- **Connector Type:** Flange
- **Exterior Finish:** Aluminium
- **Thread Type:** CW
- **Item Weight:** 140 Grams
- **Number of Pieces:** 1

## 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

## 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.nz/products/643949745-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct-fits](https://www.desertcart.nz/products/643949745-neverest-rk-4-professional-backdraft-shutter-damper-connector-duct-fits)

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-25*