---
product_id: 490288611
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: "HK$918"
currency: HKD
in_stock: true
url: https://www.desertcart.hk/products/490288611-4-inch-backdraft-damper-for-straight-or-flex-duct-bathroom
store_origin: HK
region: Hong Kong
---

# 60W power for high velocity airflow Heat-resistant -22°F to 400°F 4-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:** HK$918
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your airflow game with the ultimate 4" 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?** HK$918 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/490288611-4-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

- • **Built to Last:** Durable steel body with aluminum valve flaps ensures long-term reliability in any HVAC system.
- • **Optimized Airflow Control:** High velocity exhaust fan design prevents backflow, enhancing indoor air quality and comfort.
- • **Seamless DIY Installation:** Press-on design fits flex or straight ducts with glue, tape, or clamps for effortless setup.
- • **Versatile HVAC Compatibility:** Perfect for bathroom, kitchen, dryer exhaust, heating, cooling, and air conditioning applications.
- • **Extreme Temperature Resilience:** Operates flawlessly from freezing -22°F up to scorching 400°F — indoor or outdoor ready.

## Overview

The ECOPRO VENT 4" Backdraft Damper features a robust steel frame with aluminum valve flaps, designed for quick installation on both flexible and straight ducts. Engineered for HVAC systems, it withstands extreme temperatures from -22°F to 400°F, ensuring reliable backflow prevention in bathroom, kitchen, and dryer exhaust setups. Lightweight yet powerful, this 60W exhaust fan accessory guarantees high velocity airflow and long-lasting performance, making it a must-have for modern ventilation solutions.

## Description

- 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")

## 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 |
|---------------|-------|
| Brand | ECOPRO VENT |
| Colour | Silver |
| Electric fan design | Exhaust Fan |
| Power Source | Corded Electric |
| Style | Modern |
| Room Type | Bathroom |
| Special Feature | High Velocity |
| Recommended Uses For Product | Cooling, Exhausting |
| Wattage | 60 Watts |
| Finish Type | Painted |
| Switch Type | Push Button |
| Item Weight | 0.16 Kilograms |
| Included Components | Cord |
| Indoor/Outdoor Usage | Indoor |
| Model Name | 9cbd9b70-f7c7-4bf2-bb79-7c8bcd5728bd |
| Control Method | Touch |
| Is It Cordless? | No |
| Number of Power Levels | 1 |
| Manufacturer | ECOPRO VENT |
| Installation Type | Duct Mount |
| Size | 4" |
| Country of Origin | USA |
| Item model number | 9cbd9b70-f7c7-4bf2-bb79-7c8bcd5728bd |
| ASIN | B08XXT326K |

## Product Details

- **Brand:** ECOPRO VENT
- **Colour:** Silver
- **Electric fan design:** Exhaust Fan
- **Power Source:** Corded Electric
- **Style:** Modern
- **Room Type:** Bathroom
- **Special Feature:** High Velocity
- **Recommended Uses For Product:** Cooling, Exhausting
- **Wattage:** 60 Watts
- **Finish Type:** Painted

## 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/71jb4lQgBQL.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/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 3](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 4](https://m.media-amazon.com/images/I/41ImBU0ARSL.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.

## 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")
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- 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 Hong Kong*
*Store origin: HK*
*Last updated: 2026-01-26*