---
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: "B/.58"
currency: PAB
in_stock: true
reviews_count: 8
category: "Repa Market"
url: https://www.desertcart.com.pa/products/175532851-repa-market-4-inch-backdraft-damper-galvanized-steel-draft-blocker
store_origin: PA
region: Panama
---

# 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:** B/.58
**Availability:** ✅ In Stock

## Summary

> 🛠️ Stop drafts, start comfort — your HVAC’s new best friend!

## 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?** B/.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/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

- • **Hassle-Free Installation:** Insert easily into metal ducts with a secure stop edge; works horizontally or vertically for versatile setups.
- • **Universal HVAC Compatibility:** Ideal for air conditioners, range hoods, bathroom vents, and more—compatible with rigid and flexible ducting.
- • **Automatic Backdraft Prevention:** Dual spring-loaded flaps allow airflow only outward, blocking cold drafts, odors, and reverse airflow effortlessly.
- • **Rugged Galvanized Steel Durability:** Built to resist high temperatures, moisture, and daily wear—perfect for kitchens, dryers, and HVAC systems.
- • **Precision Fit for Seamless Integration:** Engineered to snugly fit 4-inch round ducts, ensuring airtight performance and no leaks.

## Overview

The Repa Market 4 Inch Backdraft Damper is a galvanized steel, spring-loaded inline vent stopper designed to fit 4-inch round ducts. It prevents reverse airflow, cold drafts, and odors by allowing air to flow only outward. Durable and easy to install, it’s compatible with a wide range of HVAC applications including kitchen exhausts, dryers, and ventilation systems, ensuring efficient and quiet operation.

## Description

NEW ARRIVALS Visit the Store NEW ARRIVALS Visit the Store REDUCERS Visit the Store REDUCERS EXHAUST COVERS Visit the Store EXHAUST COVERS PLASTIC DUCT CONNECTORS Visit the Store PLASTIC DUCT CONNECTORS HEAVY METAL REDUCERS Visit the Store HEAVY METAL REDUCERS DUCTING END CAPS Visit the Store DUCTING END CAPS AIR VENT COVERS Visit the Store AIR VENT COVERS INDUSTRIAL AIR VENT LOUVERS Visit the Store INDUSTRIAL AIR VENT LOUVERS 3 WAY DUCT CONNECTORS Visit the Store 3 WAY DUCT CONNECTORS ROUND METAL VENT COVERS Visit the Store ROUND METAL VENT COVERS ROUND PLASTIC VENT COVERS Visit the Store ROUND PLASTIC VENT COVERS PLASTIC ACCESS PANELS Visit the Store PLASTIC ACCESS PANELS METAL ACCESS PANELS Visit the Store METAL ACCESS PANELS THROUGH-WALL VENTILATION Visit the Store THROUGH-WALL VENTILATION ROOF AND VENT CAPS Visit the Store ROOF AND VENT CAPS BACKDRAFT DAMPERS Visit the Store BACKDRAFT DAMPERS

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: Thank you! - Living in the deep south, after installing a new kitchen exhaust fan the down-draft from the attic was overwhelming. Especially since kitchen exhaust fans are located right over the stove and it is canning season! This item is wonderful. There is no more down-draft at all and combined with my wonderful new exhaust fan my kitchen is comfortable again. At least as comfortable as it can be when I am canning in the summer time in the deep south ;) Great product, shipping time was fast, installation was easy. Thank you!

## 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 |
|---------------|-------|
| Best Sellers Rank | #203,782 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #455 in HVAC Ducting |
| Brand | Repa Market |
| Color | Silver |
| Customer Reviews | 4.4 out of 5 stars 990 Reviews |
| Manufacturer | REPA MARKET |
| Material | Galvanized Steel |
| Number of Pieces | 1 |
| Product Dimensions | 4"L x 3.46"W x 4"Th |

## 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/71PnvUBtxOL.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/61sxIhT8Q7L.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/81hC96pXepL.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/81BWbSWvu7L.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/81-Smn5RpHL.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

### ⭐⭐⭐⭐⭐ Thank you!
*by P***M on August 14, 2020*

Living in the deep south, after installing a new kitchen exhaust fan the down-draft from the attic was overwhelming. Especially since kitchen exhaust fans are located right over the stove and it is canning season! This item is wonderful. There is no more down-draft at all and combined with my wonderful new exhaust fan my kitchen is comfortable again. At least as comfortable as it can be when I am canning in the summer time in the deep south ;) Great product, shipping time was fast, installation was easy. Thank you!

### ⭐⭐⭐⭐ Works but spring is weak
*by J***H on January 4, 2024*

This damper works, but the spring is very weak. If you tip it anywhere past horizontal the doors fall open, so it can only be installed with the doors facing up or horizontally. Additionally if the doors open all the way to the center, the springs are not strong enough to push them closed again. I haven't run into an issue with this yet, but just noticed during the installation and will need to check at some point to make sure they are not stuck open.

## 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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**Shop now:** [https://www.desertcart.com.pa/products/175532851-repa-market-4-inch-backdraft-damper-galvanized-steel-draft-blocker](https://www.desertcart.com.pa/products/175532851-repa-market-4-inch-backdraft-damper-galvanized-steel-draft-blocker)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-24*