---
product_id: 535768463
title: "Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose"
brand: "hon&guan"
price: "HK$28"
currency: HKD
in_stock: false
reviews_count: 9
url: https://www.desertcart.hk/products/535768463-hon-and-guan-duct-damper-4-inch-backdraft-damper-one
store_origin: HK
region: Hong Kong
---

# Galvanized Steel Lightweight Design One-Way Airflow Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose

**Brand:** hon&guan
**Price:** HK$28
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Elevate Your Airflow Game!

## Quick Answers

- **What is this?** Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose by hon&guan
- **How much does it cost?** HK$28 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/535768463-hon-and-guan-duct-damper-4-inch-backdraft-damper-one)

## Best For

- hon&guan enthusiasts

## Why This Product

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

## Key Features

- • **Silent Operation:** Rubber ring guarantees 100% closure and whisper-quiet function.
- • **Durable Materials:** Constructed with galvanized steel and aluminum for long-lasting use.
- • **Smart Airflow Control:** Automatically prevents backflow, enhancing ventilation efficiency.
- • **Versatile Applications:** Perfect for range hoods, bathroom fans, and HVAC systems.
- • **Effortless Installation:** Designed for horizontal setups, ensuring optimal performance.

## Description

Full description not available

## Features

- 【Material】Hon&Guan 4 backdraft damper and the flap leaves is made of a galvanized steel, the axis are made of aluminum, while the spring are made of carbon steel-2PCS
- 【Installation method】The position of the 4 inch duct damper spring should be horizontal for horizontal installations so that it can open and close optimally
- 【Wide applications】Back draught valves can be inserted into havc ducting which are flexible or non-flexible. Designed for use with range hoods, bathroom fans, kitchen and other home HVAC applications
- 【Lightweight valve wings】The valve wings open under the pressure created by the airflow; when the air flows in the opposite direction, it is automatically closed under the action of the spring, so as to cut off the flow
- 【Backdraft Shutter】Hon&Guan vent damper designed to improve ventilation by preventing air from re-circulating when the fans are not in use, rubber ring ensure 100% closure and quiet closing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Hon&Guan |
| Item Weight | 7.8 ounces |
| Product Dimensions | 4 x 4 x 7 inches |
| Country of Origin | China |
| Size | 4 inch-2pcs |
| Color | Sliver |
| Material | Galvanized Steel |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose - Image 1](https://m.media-amazon.com/images/I/617RO7vROjL.jpg)
![Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose - Image 2](https://m.media-amazon.com/images/I/710NQ7sBM1L.jpg)
![Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose - Image 3](https://m.media-amazon.com/images/I/61hDknzZleL.jpg)
![Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose - Image 4](https://m.media-amazon.com/images/I/7167fL5uOzL.jpg)
![Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose - Image 5](https://m.media-amazon.com/images/I/61loKx2xINL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Quiet and reliable
  

*by N***N on Reviewed in the United States on September 24, 2024*

I am using this back flow preventer inline with a mechanical fan as the purge for my sauna. Works great, installed some fine mesh hardware cloth over the end to keep out crawlies and doesn’t seem to affect the operation. Closes nice and smooth without the normal tinny bang. Super easy to install in a 4” access hole with a dryer diverter tip, perfect fit so it is true to size as advertised.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    just what i needed
  

*by K***Z on Reviewed in the United States on September 28, 2024*

Due to the construction of my home, i was unable to exhaust my portable ac unit through a window. I decided to run a vent through the attic access. Needed this to keep bugs from getting into the house. Works great.

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    It works. Keeps the air drafts out.
  

*by F***K on Reviewed in the United States on August 31, 2023*

I modified my exhaust vent and added this backdraft damper to reduce hot air and anything else from coming in when the unit is not running. It would have been better to install the damper in the far end of the duct (close to the window), but I would have needed to buy and modify a whole new window kit to make that work. Plus, my window does have a screen. The damper works well.install tip:Be sure to orient your damper so that the hinge is in the vertical position. This will ensure both flaps close properly with no air flow.

## Frequently Bought Together

- Hon&Guan Duct Damper 4 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 4 Inch Duct Dryer Vent Hose
- Hon&Guan 4 Inch Inline Booster Duct Fan with Speed Controller - 130 CFM Airflow with 6W Ultra-Low Power and Low Noise

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**Shop now:** [https://www.desertcart.hk/products/535768463-hon-and-guan-duct-damper-4-inch-backdraft-damper-one](https://www.desertcart.hk/products/535768463-hon-and-guan-duct-damper-4-inch-backdraft-damper-one)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-25*