---
product_id: 299460619
title: "- 4\" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4\")"
brand: "ecopro vent"
price: "฿2441"
currency: THB
in_stock: true
reviews_count: 8
category: "Ecopro Vent"
url: https://www.desertcart.co.th/products/299460619-4-inch-backdraft-damper-for-straight-or-flex-duct-bathroom
store_origin: TH
region: Thailand
---

# Easy DIY press-on assembly Heat-resistant -22°F to 400°F Ø4 inch steel/aluminum build - 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4")

**Brand:** ecopro vent
**Price:** ฿2441
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your airflow game with the ultimate backdraft damper!

## Quick Answers

- **What is this?** - 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4") by ecopro vent
- **How much does it cost?** ฿2441 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/299460619-4-inch-backdraft-damper-for-straight-or-flex-duct-bathroom)

## Best For

- ecopro vent enthusiasts

## Why This Product

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

## Key Features

- • **Effortless DIY Installation:** Press-on design with glue, tape, or clamps means no professional help needed—upgrade your airflow in minutes.
- • **Extreme Temperature Resilience:** Operates flawlessly from freezing -22°F up to scorching 400°F—perfect for any HVAC environment.
- • **Versatile Indoor & Outdoor Use:** Ideal for bathroom, kitchen, and dryer exhaust systems, preventing backflow and improving air quality.
- • **Silent & Efficient Backdraft Prevention:** Bladeless aluminum valve flaps stop unwanted airflow and eliminate noisy vent drops—experience peace of mind.
- • **Precision Engineered Ø4" Steel & Aluminum:** Robust materials ensure durability and seamless integration with flexible or straight ducts.

## Overview

This 4-inch backdraft damper features a durable steel body with aluminum valve flaps, designed for quick DIY installation on flexible or straight ducts. Heat-resistant from -22°F to 400°F, it’s perfect for HVAC, bathroom, kitchen, and dryer exhaust systems, effectively preventing backflow and reducing noise for a cleaner, quieter environment.

## Description

Our products are made out of high quality plastic and coated steel. Guaranteed long life and durability. good compatibility with other ECOPRO VENT products.

Review: works good - works great.stopes backflow of air
Review: Works as expected - Absolutely fantastic. You hear that vent dropping sound when turning off the range hood. Not sure why was it so hard to find at local home depot tho

## Features

- Ø4 Inch steel backdraft damper with aluminum valve.
- For use with the Ø4 Inch Round flexible or straight Pipe Ducting systems
- Quick and easy to assemble - DIY Press on chosen duct - flex or straight - and by using montage glue. tape or steel clamps tighten the connection.
- Perfect for heating, cooling or air conditioning - HVAC. Bathroom and kitchen air exhaust.
- Heat-resistant from: -22 °F to 400°F. / Perfect for indoor and outdoor use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08XXT326K |
| Best Sellers Rank | #177,068 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #609 in HVAC Ducting |
| Blade Material | Plastic |
| Brand | ECOPRO VENT |
| Brand Name | ECOPRO VENT |
| Collection Name | Ventilation Fans |
| Control Method | Touch |
| Controller Type | Button Control |
| Customer Reviews | 4.3 out of 5 stars 157 Reviews |
| Electric Fan Design | Exhaust Fan |
| Electric fan design | Exhaust Fan |
| Finish Type | Painted |
| Indoor Outdoor Usage | Indoor |
| Is Product Cordless | No |
| Item Weight | 0.16 Kilograms |
| Material | Metal |
| Model Name | 9cbd9b70-f7c7-4bf2-bb79-7c8bcd5728bd |
| Model Number | 9cbd9b70-f7c7-4bf2-bb79-7c8bcd5728bd |
| Mounting Type | Duct Mount |
| Number of Blades | 5 |
| Number of Power Levels | 1 |
| Power Source | Corded Electric |
| Recommended Uses For Product | Cooling, Exhausting |
| Room Type | Kitchen |
| Special Feature | Bladeless |
| Special Features | Bladeless |
| Style | Modern |
| Unit Count | 1.0 Count |
| Wattage | 60 watts |

## Product Details

- **Brand:** ECOPRO VENT
- **Electric fan design:** Exhaust Fan
- **Power Source:** Corded Electric
- **Style:** Modern
- **Room Type:** Kitchen
- **Special Feature:** Bladeless
- **Recommended Uses For Product:** Cooling, Exhausting
- **Mounting Type:** Duct Mount
- **Controller Type:** Button Control
- **Material:** Metal

## Images

![- 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4") - Image 1](https://m.media-amazon.com/images/I/41ImBU0ARSL.jpg)
![- 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4") - Image 2](https://m.media-amazon.com/images/I/71EoEjiXnxL.jpg)
![- 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4") - Image 3](https://m.media-amazon.com/images/I/71HGhwLU+dL.jpg)
![- 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4") - Image 4](https://m.media-amazon.com/images/I/71jb4lQgBQL.jpg)

## Questions & Answers

**Q: Can this be mounted horizontally?**
A: Yes, I put it in a room AC vent, to outside, it wasnt at a 90 degree angle, appr a 45 anyway, nice product, spring loaded, working great for me

**Q: Can the 12" mount vertically?  My application need is for my kitchen exhaust fan which exits into attic.**
A: NOTE: by most state's codes; nothing should be openly venting into the attic.  I can run through the attic, but needs to be vented outside.  That said, the flapper is spring loaded and is opened by the force of the airflow created by your exhaust fan.  I suspect it can be mounted vertically, just make sure the flappers are oriented so they open in the direction of airflow (upward) when the exhaust fan comes on.  Hope this helps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ works good
*by D***N on November 24, 2025*

works great.stopes backflow of air

### ⭐⭐⭐⭐⭐ Works as expected
*by S***I on June 10, 2025*

Absolutely fantastic. You hear that vent dropping sound when turning off the range hood. Not sure why was it so hard to find at local home depot tho

### ⭐⭐⭐⭐⭐ Works great
*by M***O on February 9, 2025*

I purchased this backdraft gate for an exhaust fan in my basement. It’s opens with pressure from the fan and seals tight against the rubber gasket when the fan is turned off. It does exactly what I wanted and fit easily on my 8” duct pipe.

## Frequently Bought Together

- - 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4")
- EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm)
- Aluminum Foil Tape, 2 inch x 65 Feet (3.9 mil), Insulation Adhesive Metal High Temperature Heavy Duty HVAC Tape, Silver for Ductwork, Dryer Vent, HVAC

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-04*