---
product_id: 361399988
title: "8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector"
brand: "kikerike"
price: "HK$372"
currency: HKD
in_stock: true
reviews_count: 13
category: "Kikerike"
url: https://www.desertcart.hk/products/361399988-8-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one
store_origin: HK
region: Hong Kong
---

# One-way airflow with minimal resistance Light spring action for low CFM efficiency Galvanized steel & aluminum build 8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector

**Brand:** kikerike
**Price:** HK$372
**Availability:** ✅ In Stock

## Summary

> 💨 Stop drafts, start fresh airflow — your ducts deserve the upgrade!

## Quick Answers

- **What is this?** 8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector by kikerike
- **How much does it cost?** HK$372 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/361399988-8-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one)

## Best For

- kikerike enthusiasts

## Why This Product

- Trusted kikerike brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Application:** Ideal for residential, commercial, and industrial use in ACs, exhaust fans, range hoods, and heating ducts—upgrade your ventilation game.
- • **Effortless Installation:** Push-in design fits snugly into 8-inch ducts with horizontal or vertical mounting, making setup quick and hassle-free.
- • **Optimized Airflow Control:** Designed for one-way airflow, it prevents backdrafts while allowing up to 90% airflow efficiency—perfect for low CFM fans and ventilation systems.
- • **Durable Metal Construction:** Galvanized steel frame with rust-resistant aluminum flaps ensures long-lasting performance and corrosion-free operation.
- • **Lightweight & Low Resistance:** Spring mechanism opens easily even with minimal airflow, ensuring your system runs smoothly without energy waste.

## Overview

The 8 Inch Draft Blocker Backdraft Damper is a galvanized steel and aluminum duct insert designed to prevent backflow and improve ventilation efficiency. Its lightweight spring mechanism allows easy airflow even at low CFM, making it ideal for a wide range of HVAC applications. Easy to install and corrosion-resistant, it enhances air quality and system performance across residential and commercial settings.

## Description

Buy 8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector: Draft Stoppers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: light weight but works as designed - pretty light weight but I think that's by design. Alum so no rust worries - very light spring action. Fit perfectly in the existing duct work. I wasn't able to use the baffle on the fan I bought for the bathroom so this was a nice alternative.
Review: Perfect for Low CFM Installs. Works great! - Perfect for my installation. Too many of these type dampers have very stiff springs and it will not work with low CFM air flows. These are great. You can blow at them with your mouth and get them to open. And they seal very well. I use them for air circulation between rooms with fans set to about 60 CFM. The last ones I got restricted about 80% of the air. These only restrict maybe 10%. This is key for low CFM situations like bath exhaust fans, for instance.

## Features

- 【Material】The 8 inch backdraft damper is made of a Galvanized steel, the flap leaves are made of aluminum
- 【Installation】The backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation
- 【Function】This airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use
- 【Wide Application】 The backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applications
- 【Note】Back draught valves can be inserted into ventilation ducts which are flexible or non flexible. Because the sizes are different backdraft damper can not be used with plastic ducts. All dimensions are measured manually, please allow 1-3mm differences

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B099JXNM75 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #6,192 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in HVAC Ducting |
| Color | Silver |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,106) |
| Date First Available | July 15, 2021 |
| Item Weight | 9.9 ounces |
| Manufacturer | Kikerike |
| Material | Metal |
| Package Dimensions | 8.86 x 8.46 x 3.7 inches |
| Size | 8 Inch |

## Images

![8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Image 1](https://m.media-amazon.com/images/I/61V2FgYfWeL.jpg)
![8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Image 2](https://m.media-amazon.com/images/I/61yLxuTVqEL.jpg)
![8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Image 3](https://m.media-amazon.com/images/I/71x-mOY091L.jpg)
![8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Image 4](https://m.media-amazon.com/images/I/71Umfgri1KL.jpg)
![8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Image 5](https://m.media-amazon.com/images/I/61VAPY6SsSL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can this be used to stop my Hot water tank from blowing out the flame on windy days?**
A: sorry, I did not use it for the flame from  HWT.

**Q: can this be used on a dryer vent or will the foam seal melt?**
A: I would say the dryer heat could damage or maybe even melt the seal. Maybe you could try removing the gasket and wrap a strip of fiberglass in it’s place.

**Q: Would this help keep out bugs?**
A: Yes it creates a barrier and only opens one way from the inside of house

**Q: Would this fit between two sections of standard, 4 inch semi-rigid ducting? Looking to add to bathroom vent fan ductwork.**
A: Yes, that's exactly how you would use it. Make sure to buy the correct HVAC aluminum (metallic) duct tape for the connection. A clamp cannot be used bc the crushing pressure would inhibit the flapper from working properly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ light weight but works as designed
*by B***L on February 16, 2026*

pretty light weight but I think that's by design. Alum so no rust worries - very light spring action. Fit perfectly in the existing duct work. I wasn't able to use the baffle on the fan I bought for the bathroom so this was a nice alternative.

### ⭐⭐⭐⭐⭐ Perfect for Low CFM Installs. Works great!
*by J***N on January 23, 2026*

Perfect for my installation. Too many of these type dampers have very stiff springs and it will not work with low CFM air flows. These are great. You can blow at them with your mouth and get them to open. And they seal very well. I use them for air circulation between rooms with fans set to about 60 CFM. The last ones I got restricted about 80% of the air. These only restrict maybe 10%. This is key for low CFM situations like bath exhaust fans, for instance.

### ⭐⭐⭐⭐⭐ Quick and easy Backdraft fix!
*by P***N on February 4, 2026*

This draft blocker worked perfect. I was concerned it wouldn't fit inside my old pipe and yet have my old elbow Go over it. It works great to prevent the cold air from going down my dryer vent. I was having trouble with condensation developing on the vent and leaking on the floor. This solve that problem I would recommend it for anybody.

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.hk/products/361399988-8-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one](https://www.desertcart.hk/products/361399988-8-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-23*