---
product_id: 366297764
title: "4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in)"
brand: "dojobkinb"
price: "€ 23.59"
currency: EUR
in_stock: true
url: https://www.desertcart.sk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one
store_origin: SK
region: Slovakia
---

# One-way airflow backdraft prevention Stainless steel spring for smooth operation Galvanized steel & aluminum build 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in)

**Brand:** dojobkinb
**Price:** € 23.59
**Availability:** ✅ In Stock

## Summary

> 🌬️ Stop the backflow, boost your airflow – ventilation perfected!

## Quick Answers

- **What is this?** 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) by dojobkinb
- **How much does it cost?** € 23.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one)

## Best For

- dojobkinb enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Application:** Perfect for ACs, exhaust fans, range hoods, and heating ducts across residential and commercial spaces.
- • **Effortless Installation:** Push-in design fits snugly into 4-inch ducts with spring positioned for optimal flap movement.
- • **Optimized Airflow Control:** One-way damper design prevents unwanted backdrafts, enhancing ventilation efficiency.
- • **Durable Metal Construction:** Galvanized steel body with aluminum flaps ensures long-lasting performance and rust resistance.
- • **Maintenance-Free Operation:** Stainless steel spring and axis guarantee smooth, reliable flap action without frequent upkeep.

## Overview

This 4-inch backdraft damper features a galvanized steel body, aluminum flaps, and a stainless steel spring mechanism designed to prevent air backflow in ventilation ducts. Easy to install and compatible with most metal duct systems, it enhances airflow efficiency in residential and commercial HVAC setups.

## Description

Full description not available

## Features

- 【Material】The 4 inch backdraft damper is made out of a Galvanized steel, the flap leaves are made of aluminum, while the Axis and spring are made of stainless steel
- 【Installation】The backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation
- 【Function】This airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use
- 【Wide Application】 These backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applications
- 【Note】Back draught valves can be inserted into ventilation ducts which are flexible or non flexible. Cannot be used with plastic ducts as the sizes are different

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | dojobkinb |
| Item Weight | 4.6 ounces |
| Package Dimensions | 5 x 4.69 x 3.74 inches |
| Size | 4 Inch |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) - Image 1](https://m.media-amazon.com/images/I/51kULEAgl7L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Can this be used for inbound furnace air to keep out bugs and cold when not on?**
A: No. It is for  dryer vent.

## Frequently Bought Together

- 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in)
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**Shop now:** [https://www.desertcart.sk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one](https://www.desertcart.sk/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-28*