---
product_id: 175532851
title: "Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation"
brand: "repa market"
price: "$37.40"
currency: USD
in_stock: true
reviews_count: 13
category: "Repa Market"
url: https://www.desertcart.us/products/175532851-repa-market-4-inch-backdraft-damper-galvanized-steel-draft-blocker
store_origin: US
region: United States of America
---

# Fits Ø4 inch ducts precisely Spring-loaded one-way airflow Durable galvanized steel build Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation

**Brand:** repa market
**Price:** $37.40
**Availability:** ✅ In Stock

## Summary

> 🛠️ Stop drafts, start comfort — ventilation perfected!

## Quick Answers

- **What is this?** Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation by repa market
- **How much does it cost?** $37.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/175532851-repa-market-4-inch-backdraft-damper-galvanized-steel-draft-blocker)

## Best For

- repa market enthusiasts

## Why This Product

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

## Key Features

- • **Versatile HVAC Compatibility:** Perfect for dryers, range hoods, exhaust fans, and HVAC systems—compatible with rigid and flexible ducts.
- • **Automatic Backdraft Prevention:** Dual spring-loaded flaps allow airflow only outward, blocking cold drafts, odors, and reverse airflow effortlessly.
- • **Effortless Installation Anywhere:** Insert easily into metal ducts horizontally or vertically for instant, secure ventilation upgrades.
- • **Rugged Galvanized Steel Construction:** Built to endure high temperatures and moisture, guaranteeing long-lasting, rattle-free performance.
- • **Precision Fit for Seamless Integration:** Engineered to snugly fit 4-inch round ducts, ensuring airtight, leak-free ventilation.

## Overview

The Repa Market 4 Inch Backdraft Damper is a galvanized steel, spring-loaded inline vent stopper designed for 4-inch round ducts. It prevents reverse airflow and unwanted drafts with dual flaps, ensuring efficient, quiet HVAC and exhaust system operation. Durable and easy to install, it fits both residential and commercial ventilation setups, enhancing airflow control and energy efficiency.

## Description

Buy Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation: Ducting - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Worked good for our hood fan - Hooked up inline with our hood fan above our stove, prevented back draft of cold air in the winter season. Easy install
Review: Good buy - Worked great. As described.

## Features

- DIMENSIONS – Fits into Ø4 Inch round ducts; Insertion neck diameter: 3.89 inch. Total width: 3.46 Inch. Precision-engineered for a tight internal fit inside metal ventilation pipes for reliable, airtight performance.
- AUTOMATIC BACKDRAFT CONTROL – 4 Inch inline draft stopper features dual spring-loaded flaps that open only in the outflow direction, stopping reverse airflow, cold air, odors, and unwanted drafts while keeping HVAC duct systems efficient and quiet.
- DURABLE GALVANIZED STEEL – Heavy-duty galvanized steel backflow damper with smooth spring action and foam seal prevents rattling and air leakage. Built to withstand high temperatures, moisture, and continuous use in dryer vents, kitchen exhausts, HVAC ductwork, and heating systems.
- EASY INSTALLATION – Simply insert the draft blocker into round ducting until the stop edge; fits Ø4 Inch metal ventilation pipes for a secure seal. Can be installed horizontally or vertically. Horizontal setups require the spring to be positioned sideways for optimal one-way airflow in your duct system.
- WIDE HVAC APPLICATIONS – Designed as a backdraft shutter for air conditioners, dryers, cooker hoods, bathroom exhausts, inline ventilation fans, range hoods, and heating ducts. Works with rigid or flexible metal ducting and spiral pipe connectors, ensuring efficient backflow prevention in residential and commercial ventilation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0822VQMHM |
| Batteries required | No |
| Best Sellers Rank | #107,407 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #192 in HVAC Ducting |
| Brand | Repa Market |
| Color | Silver |
| Customer Reviews | 4.4 4.4 out of 5 stars (981) |
| Finish types | Galvanized |
| Global Trade Identification Number | 07427046530293 |
| Included Components | Backdraft Damper |
| Item Weight | 4.6 ounces |
| Manufacturer | REPA MARKET |
| Material | Galvanized Steel |
| Number of Pieces | 1 |
| Product Dimensions | 4"L x 3.46"W x 4"Th |
| Specific instructions for use | Commercial/Residential |

## Product Details

- **Brand:** Repa Market
- **Color:** Silver
- **Material:** Galvanized Steel
- **Number of Pieces:** 1
- **Product Dimensions:** 4"L x 3.46"W x 4"Th

## Images

![Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 1](https://m.media-amazon.com/images/I/31TzZPKsLeL.jpg)
![Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 2](https://m.media-amazon.com/images/I/31ZuHniEYmL.jpg)
![Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 3](https://m.media-amazon.com/images/I/31uda4iTYbL.jpg)
![Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 4](https://m.media-amazon.com/images/I/419uDIvpMKL.jpg)
![Repa Market 4 Inch Backdraft Damper – Galvanized Steel Draft Blocker/One-Way Airflow Vent Stopper/HVAC Exhaust Dryer Duct Connector – Inline Spring-Loaded Backflow Preventer for Secure Ventilation - Image 5](https://m.media-amazon.com/images/I/41O9F4cy7gL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked good for our hood fan
*by J***. on December 23, 2025*

Hooked up inline with our hood fan above our stove, prevented back draft of cold air in the winter season. Easy install

### ⭐⭐⭐⭐⭐ Good buy
*by A***R on June 20, 2025*

Worked great. As described.

### ⭐⭐⭐⭐ Good product
*by M***R on June 13, 2020*

The product is good but the spring has a higher than expected tension. Had to rework the spring to ease the tension to allow 110 CFM fan to open flaps fully. Installed real easy into existing metal sleeve.

## Frequently Bought Together

- Draft Blocker 4'' Inch - Backdraft Damper - Draft Stopper - Backflow Preventer - Inline Fan Vent Deflector - One-Way Airflow Ducting - Dryer Duct Connector with Backdraught Flap
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- 4'' Inch Duct Splitter for Exhaust Fan Dryer Vent Hose 3 Way Duct Hose Connector, Y Shape, Y Joint Metal (4'' Inch, Y Shape)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-02*