---
product_id: 251530581
title: "neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal"
brand: "neverest"
price: "Bs.55"
currency: BOB
in_stock: true
reviews_count: 8
url: https://www.desertcart.bo/products/251530581-neverest-rki-backdraft-shutter-4-inch-inline-extractor-fan-backdraft
store_origin: BO
region: Bolivia
---

# Automatic backflow flap operation Rubber seal for silent closure Robust galvanized steel build neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal

**Brand:** neverest
**Price:** Bs.55
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your ventilation game with neverest® — where efficiency meets silent strength!

## Quick Answers

- **What is this?** neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal by neverest
- **How much does it cost?** Bs.55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/251530581-neverest-rki-backdraft-shutter-4-inch-inline-extractor-fan-backdraft)

## 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:** Slide-in design with strong spring mechanism allows quick horizontal or vertical mounting—no hassle, no fuss.
- • **Universal Compatibility:** Fits standard 100mm metal ducts, perfect for retrofitting HVAC, cooker hoods, dryers, and more.
- • **Whisper-Quiet Operation:** Integrated rubber seal ensures 100% airtight closure with zero noise when the fan is off.
- • **Seamless Airflow Control:** Automatic flap opens with exhaust flow and closes instantly to prevent backdrafts and cold air intrusion.
- • **Industrial-Grade Durability:** Crafted from galvanized steel and stainless components for long-lasting performance in any environment.

## Overview

The neverest® RKI Backdraft Shutter is a premium 100mm inline extractor fan damper made from galvanized steel and rubber, designed to prevent backflow and cold air ingress in HVAC systems. Certified to DIN EN 1506 standards, it features an automatic flap with a stainless steel spring for versatile horizontal or vertical installation, ensuring silent, airtight closure and universal compatibility with metal ducts in residential, commercial, and industrial applications.

## Description

Full description not available

## Features

- neverest RKI check valve is very robust and durable. The backflow flap opens and closes automatically. The strong stainless steel spring allows installation horizontally or vertically. Perfect for retrofitting ventilation systems without backflow flap. The rubber ring ensures 100% closure and quiet closing when the exhaust fan is not in operation.
- Function: the exhaust air backflow flap is universally applicable in all standard round ventilation pipes and flex pipes according to DIN EN 1506. The backflow flap prevents the exhaust air from flowing back or the inflow of cold outside air. The flaps open when the fan blows the exhaust air outwards and closes automatically as soon as the airflow breaks off.
- Versatile use in all supply air and exhaust systems, such as air conditioners, dryers, cooker hood, dryers, heating systems and ventilation systems in private homes, commercial and industry.
- Perfect choice for hobbyists and professionals. The backflow flap is very stable, temperature-resistant and reliable. Installation is simple, just slide the ventilation pipe and enjoy the benefits.
- We are subject matter experts and there for you. If you have any questions or complaints, please contact our customer service directly. Your request will be processed immediately.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | neverest |
| Part Number | 4054503048140 |
| Product Dimensions | 13.5 x 13.5 x 13.5 cm; 108.86 g |
| Item model number | 100mm |
| Size | 100mm |
| Colour | Silver |
| Style | Industrial |
| Material | Rubber, Stainless Steel |
| Item Package Quantity | 1 |
| Certification | DIN EN 1506 |
| Usage | For use in air conditioners, tumble dryers, exhaust systems, cooker hoods, heating systems, ventilation systems and other HVAC applications in residential, commercial and industrial sectors |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 109 g |

## Product Details

- **Material:** Rubber, Stainless Steel
- **Brand:** neverest
- **Item dimensions L x W x H:** 13.5 x 13.5 x 13.5 centimetres
- **Exterior finish:** Zinc
- **Inlet connection size:** 4 inches
- **Inlet connection type:** Outside Diameter Flared
- **Outlet connection type:** Compression
- **Number of ports:** 2
- **Outlet connection size:** 4 inches
- **Specification met:** DIN EN 1506

## Images

![neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal - Image 1](https://m.media-amazon.com/images/I/71H9GJrhllL.jpg)
![neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal - Image 2](https://m.media-amazon.com/images/I/81-jrvwIhWL.jpg)
![neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal - Image 3](https://m.media-amazon.com/images/I/71d0obPicDL.jpg)
![neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal - Image 4](https://m.media-amazon.com/images/I/71Ibbi1FDaL.jpg)
![neverest® RKI Backdraft Shutter 4 inch Inline Extractor Fan Backdraft Damper 100mm Fits Only with Metal Ducts - Robust, Galvanized Steel with Rubber Seal - Image 5](https://m.media-amazon.com/images/I/71YSAWRU6sL.jpg)

## Available Options

This product comes in different **Colour Name, Size name** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Finally, a quality backdraft stopper!
*by W***L on 8 September 2022*

The media could not be loaded. I’ve tried a few backdraft stopping vents and shutters over the last few weeks. All were flimsy, noisy, poorly constructed or damaged in transit.This shutter was everything I was hoping for.We’ve got a fairly powerful fan and it has no problems pushing the sprung loaded flaps. The springs and rubber on the seal ensure the smooth and quiet opening and closing and feel like they’ll stop most excess flapping caused by the wind.No problems with the rubber seal when pushing into our 150mm plastic duct (I did push the rubber seal and not the metal to ensure the seal didn’t come off the housing though).Looks and feels well made - the product photography is refreshingly accurate.Depending on how well this performs, I think I have enough fan pressure to install two of these and create a sort of airlock… but that’s for another day!So, thank you neverest, you’ve made my day!

### ⭐⭐⭐⭐⭐ Excellent product
*by P***N on 29 November 2018*

This item has solved the problem of a freezing cold backdraft in my kitchen. My extractor vent is on an exposed wall on a 4th floor flat- it fits inside a 150mm ducting from a DIY store and it avoids the need for a long ladder. The extractor works well even in the lowest fan setting and it has caused no additional noise on the highest setting - i have a powerful extractor and i had been worried about impedence to flow affecting its performance but this backdraft shutter has not caused any noticeable reduction to flow. It seems better made than plastic alternatives available in uk and i found customer services to be very helpful. It has been in use for 10 months now and even in the strongest gales it does not make annoying noises - perhaps only an occasional flap but the sound is well dampened by a rubber seal.

### ⭐⭐⭐⭐ Good Design But Not Perfect Because It Needs to be tuned to your fan and installation.
*by M***A on 3 December 2018*

This is a nice product and works, but it has its downfalls.Pros:This pushed perfectly inside my 150mm pipe, used a light bit of grease to help it in. (see pics)This stops all draughts has made a huge difference in the temperature, comfort of my cold kichen.Definitely saving money heating bills.Cons:Due to the spring pressure on the flap my Fan 150mm/ 230m3/hr would not open the flap fully, I would say about 30 to 40 degress, See picture. This results in a slightly steamier kitchen when cooking. See pics of fan flaps partially open.Solution/TweaksI disabled the middle spring by flipping arms to other side of flap. The flap opened easier and air flow increased. Problem is when it was windy it flapped about more which was annoying. If installation does not suffer suction from the wind due to a protected location of exhaust grill, this solution would be perfect.I re-attached the spring and bent arms of middle spring to reduce leverage on flap, but still has a bit of resistance. This was alot better in the wind, only occsanional flap in large gusts. See pics. I have not had a big cook to see if Steam situation has got a bit better.I will not be removing the flap, as it must be saving me a fortune on heating. But I might consider fitting a high flow fan to increase to get that flap open a bit more.People cannot really complain that it flaps about or does not open as much, as each benefit has it cons.If you want a closed hole without flapping in wind then your flow will be reduce.If you want better flow, then you will get more flapping in wind.

## Frequently Bought Together

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-03-11*