---
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: "4583 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Dojobkinb"
url: https://www.desertcart.kg/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one
store_origin: KG
region: Kyrgyzstan
---

# One-way airflow with backdraft prevention Spring-loaded flap for optimal sealing 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:** 4583 som
**Availability:** ✅ In Stock

## Summary

> 🚫❄️ Stop drafts, save energy, breathe better!

## 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?** 4583 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/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

- • **Effortless Installation:** Push-in design fits snugly into 4-inch ventilation pipes with horizontal or vertical mounting for versatile setup.
- • **Durable Metal Construction:** Galvanized steel body with aluminum flaps and stainless steel spring ensures long-lasting performance and corrosion resistance.
- • **Low-Maintenance Reliability:** Spring-loaded flap opens smoothly with airflow and closes tightly to block backdrafts without manual intervention.
- • **Universal Vent Compatibility:** Ideal for ACs, exhaust fans, range hoods, heating ducts, and more in residential, commercial, and industrial settings.
- • **Energy-Saving Airflow Control:** Prevents cold drafts and unwanted backflow, enhancing HVAC efficiency and reducing energy waste.

## Overview

This 4-inch backdraft damper features a galvanized steel body, aluminum flap leaves, and a stainless steel spring for durability and corrosion resistance. Designed for easy push-in installation in ventilation ducts, it prevents unwanted air backflow and drafts, improving HVAC efficiency across residential, commercial, and industrial applications. Compatible with flexible and rigid ducts (excluding plastic), it offers a reliable, low-maintenance solution to optimize airflow and reduce energy loss.

## Description

desertcart.com: 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Vent Deflector (4 in) : Home & Kitchen

Review: Works! - This seems to work as described. The cold air seeping in through the dryer vent has been significantly reduced. I had to work a bit on the installation because this requires a female fitting on both ends, but a little time with a pair of pliers modified the old elbow enough to make it work. It was WAY cheaper than installing the whole outlet. Overall, it fit and was easy to install. This is what I was looking for.
Review: Good backdraft seal - I like everything about this product, and it was as described on desertcart. One thing to consider though, is that the duct connected on both sides has to be female, that way there is no restriction on the flap opening.

## 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 |
|---------------|-------|
| ASIN | B099R69LM2 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #395,605 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,015 in HVAC Ducting |
| Customer Reviews | 4.5 4.5 out of 5 stars (148) |
| Date First Available | July 19, 2021 |
| Item Package Quantity | 1 |
| Item Weight | 5 ounces |
| Manufacturer | dojobkinb |
| Package Dimensions | 5.2 x 4.13 x 3.7 inches |
| Size | 4 Inch |

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works!
*by S***E on February 4, 2026*

This seems to work as described. The cold air seeping in through the dryer vent has been significantly reduced. I had to work a bit on the installation because this requires a female fitting on both ends, but a little time with a pair of pliers modified the old elbow enough to make it work. It was WAY cheaper than installing the whole outlet. Overall, it fit and was easy to install. This is what I was looking for.

### ⭐⭐⭐⭐⭐ Good backdraft seal
*by M***Y on July 18, 2023*

I like everything about this product, and it was as described on Amazon. One thing to consider though, is that the duct connected on both sides has to be female, that way there is no restriction on the flap opening.

### ⭐⭐⭐⭐⭐ Smooth operation
*by D***S on December 16, 2025*

Quick install, the vent was well built and the operation was very smooth.

## 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.kg/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one](https://www.desertcart.kg/products/366297764-4-inch-draft-blocker-backdraft-damper-duct-draft-stopper-one)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-03-19*