---
product_id: 356224464
title: "4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans"
brand: "younthye"
price: "S$39"
currency: SGD
in_stock: true
reviews_count: 6
url: https://www.desertcart.sg/products/356224464-4-inch-backdraft-damper-2pcs-inline-springs-loaded-backflow-preventer
store_origin: SG
region: Singapore
---

# 4" Diameter Backflow Prevention Durable Steel 4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans

**Brand:** younthye
**Price:** S$39
**Availability:** ✅ In Stock

## Summary

> 🚀 Seal the Deal on Airflow Control!

## Quick Answers

- **What is this?** 4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans by younthye
- **How much does it cost?** S$39 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/356224464-4-inch-backdraft-damper-2pcs-inline-springs-loaded-backflow-preventer)

## Best For

- younthye enthusiasts

## Why This Product

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

## Key Features

- • **Compact Design:** Space-saving 4" size fits standard duct openings.
- • **Premium Materials:** Constructed from galvanized steel and aluminum for longevity.
- • **Automatic Operation:** Flap opens and closes to block unwanted drafts effortlessly.
- • **Versatile Applications:** Perfect for range hoods, bathroom fans, and HVAC systems.
- • **Effortless Installation:** Easily push into ducting for a seamless fit.

## Overview

The 4 Inch Backdraft Damper is a premium, durable solution designed to prevent backflow and unwanted drafts in your home ventilation systems. Made from high-quality galvanized steel and aluminum, this easy-to-install damper is perfect for range hoods and bathroom fans, ensuring optimal airflow and efficiency.

## Description

4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans

## Features

- Size of Backdraft Damper - 4 inch/ 100mm in diameter, 3.5inch/ 88mm in length, 0.5MM/0.02 inch in thickness, 2 in package. Please confirm the size before purchase.
- Durable & Premium - 4 backdraft damper is made of galvanized steel and the dryer vent valve flaps are made of aluminium the butterfly damper axis and spring are made of stainless steel.
- Preventing Unwanted Drafts - 4inch backdraft damper opens and closes automatically to prevent backflow and debris from entering ducting.
- Application Scenarios - 4 backdraft damper fit for 4" Duct Openings. Backdraft damper 4 inch designed for use with range hoods, bathroom fans and other home HVAC applications. Not for use in plastic ducts.
- Easy to Installation - The 4 inch duct 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Electric Fan Design | Exhaust Fan |
| Style Name | Modern |
| Color | silver |
| Blade Material | Aluminum |
| Material Type | Alloy Steel |
| Switch Type | Push Button |
| Indoor Outdoor Usage | Indoor |
| Control Method | Touch |
| Is Electric | No |
| Number of Blades | 2 |
| Room Type | Kitchen |
| Additional Features | Spring-Loaded Folding Blades, Galvanized Steel, Aluminium |
| Recommended Uses For Product | Air Circulation |
| Controller Type | Button Control |

## Product Details

- **Brand:** YOUNTHYE
- **Color:** silver
- **Electric fan design:** Exhaust Fan
- **Style:** Modern
- **Room Type:** Bathroom
- **Recommended Uses For Product:** Ventilating
- **Included Components:** 2 x 4 Inch Backdraft Damper
- **Indoor/Outdoor Usage:** Indoor
- **Model Name:** 4 Inch Backdraft Damper
- **Control Method:** Touch

## Images

![4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans - Image 1](https://m.media-amazon.com/images/I/61Vv7QBnk7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does the job as intended.
*by K***R on September 13, 2023*

I installed a couple in my basement to exhaust my resin fumes. However when I'm not exhausting anything I wanted a good seal to prevent bugs or a draft to come back in. Does a great job.

### ⭐⭐⭐⭐ Works in the dryer hose!
*by R***S on July 16, 2024*

I kept having cold air blow back into the dryer, so I installed this, which wasn't easy, but it took care of the problem!

### ⭐⭐⭐ Doesn’t totally seal
*by M***W on July 6, 2024*

If you need to separate a Y pipe and not have cross contamination of air, this is not the best seal. It’s a good damper, but if you are looking to seal the channel it will have a slight opening. Otherwise it’s just fine.

## Frequently Bought Together

- YOUNTHYE 4 Inch Backdraft Damper, 2PCS Inline Springs Loaded Backflow Preventer Backflow Shutter, One-Way Airflow Ducting Insert for 4”Ducting in Range Hoods and Bathrooms Fans
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**Shop now:** [https://www.desertcart.sg/products/356224464-4-inch-backdraft-damper-2pcs-inline-springs-loaded-backflow-preventer](https://www.desertcart.sg/products/356224464-4-inch-backdraft-damper-2pcs-inline-springs-loaded-backflow-preventer)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-20*