---
product_id: 209376297
title: "AC Infinity 4\" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans"
brand: "ac infinity"
price: "€ 43.98"
currency: EUR
in_stock: true
reviews_count: 13
category: "Ac Infinity"
url: https://www.desertcart.at/products/209376297-ac-infinity-4-backdraft-damper-one-way-airflow-ducting-insert
store_origin: AT
region: Austria
---

# spring-loaded airflow blades airtight rubber gasket seal 4-inch duct fit precision AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans

**Brand:** ac infinity
**Price:** € 43.98
**Availability:** ✅ In Stock

## Summary

> 🔄 Stop backdrafts before they start — airflow perfected with style!

## Quick Answers

- **What is this?** AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans by ac infinity
- **How much does it cost?** € 43.98 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/209376297-ac-infinity-4-backdraft-damper-one-way-airflow-ducting-insert)

## Best For

- ac infinity enthusiasts

## Why This Product

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

## Key Features

- • **Smart Spring-Loaded Blades:** Innovative folding blades open with minimal airflow, ensuring efficient one-way ventilation.
- • **Versatile Mounting Options:** Mount horizontally or vertically to suit any HVAC setup without compromising performance.
- • **Airtight Rubber Gasket Seal:** Premium outer gaskets create a tight, secure seal to block drafts, debris, and pests.
- • **Durable Galvanized Steel Build:** Powder-coated steel body guarantees long-lasting durability and sleek aesthetics.
- • **Seamless 4" Duct Compatibility:** Perfectly engineered to fit standard 4-inch duct openings for effortless integration.

## Overview

The AC Infinity 4" Backdraft Damper is a high-quality HVAC accessory designed to prevent unwanted airflow and debris from entering duct systems. Featuring spring-loaded aluminum blades and airtight rubber gaskets, it fits standard 4-inch ducts and mounts in any orientation. Its galvanized steel construction with powder coat finish ensures durability and a professional look, making it ideal for range hoods, bathroom fans, and other ventilation applications.

## Description

AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - desertcart.com

Review: Performs well. Nicely made product at a fair price! - The AC Infinity products I’ve been getting all seen to be superior quality pieces (fan, collars, dampers). Couldn’t be happier. Shutters open easily but close solidly when there’s no air flow. Thank you a great product at a fair price!
Review: Tight seal and quality construction - I needed some sort of back draft prevention for my bathroom vent fan setup because I was getting bugs and draft in my basement bathroom. These fit right up to other 4 inch ducting, and I used rubber connectors to secure these on. They look sleek, work great, and they have a great quality seal and don't let air back in. They have a double flap to prevent back drafting. I used two of them in my set up to keep each line isolated before a combining y connection

## Features

- An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications.
- Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts.
- Mounts horizontally or vertically to prevent backflow and debris from entering ducting.
- Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow.
- Fit for 4 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0842XSTV9 |
| Best Sellers Rank | #16,153 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in HVAC Ducting |
| Brand Name | AC Infinity |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,996) |
| Item Dimensions | 5 x 3.81 x 3.81 inches |
| Manufacturer | AC Infinity |
| Material Type | Alloy Steel, Aluminum |
| Model Number | AC-BDD4-B |
| Size | 4" |
| UPC | 819137021303 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** AC Infinity
- **Color:** Black
- **Item dimensions L x W x H:** 5 x 3.81 x 3.81 inches
- **Manufacturer:** AC Infinity
- **Material:** Alloy Steel, Aluminum
- **Size:** 4"
- **UPC:** 819137021303

## Images

![AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - Image 1](https://m.media-amazon.com/images/I/51lALiYTYEL.jpg)
![AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - Image 2](https://m.media-amazon.com/images/I/51jBoph3RiL.jpg)
![AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - Image 3](https://m.media-amazon.com/images/I/51Vig+xStqL.jpg)
![AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans - Image 4](https://m.media-amazon.com/images/I/51JTxQHs5SL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Performs well. Nicely made product at a fair price!
*by S***E on April 8, 2026*

The AC Infinity products I’ve been getting all seen to be superior quality pieces (fan, collars, dampers). Couldn’t be happier. Shutters open easily but close solidly when there’s no air flow. Thank you a great product at a fair price!

### ⭐⭐⭐⭐⭐ Tight seal and quality construction
*by C***. on December 2, 2025*

I needed some sort of back draft prevention for my bathroom vent fan setup because I was getting bugs and draft in my basement bathroom. These fit right up to other 4 inch ducting, and I used rubber connectors to secure these on. They look sleek, work great, and they have a great quality seal and don't let air back in. They have a double flap to prevent back drafting. I used two of them in my set up to keep each line isolated before a combining y connection

### ⭐⭐⭐⭐⭐ Great company, great products
*by 玄***衡 on March 6, 2025*

After reading through dozens of reviews and product information, we first bought the AC Infinity Flexible 6-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust. It was packaged so well you could send it as a Christmas gift, the quality of the duct tubing was outstanding. Fast forward a week while we were installing the new stove exhaust fan, we realized we would need this flapper piece, as the old one was getting stuck. We were so impressed with the duct tubing that we purchased this product from AC as well, and were not disappointed. It is the Mercedes of exhaust flappers. This AC flapper was the exact size advertised at 5.79" width/diameter, which was just a smidgen smaller than most of the others advertised at 5.90" diameter. So instead of having to monkey around with it, it slipped perfectly inside the Vikio range hood 30" under cabinet kitchen hood with 980 CFM, 3 speed gesture sensing & touch control panel in stainless steel, vent hole on top the hood. A little larger it would not have worked, we are grateful the AC specs are perfect, it made the install a dream come true. I do agree with another review I read, in that the AC 6" ducting is a tight fit on their own product/flapper, although I got it to slip on, it was as tight as could be without being unworkable, but the bottom line is it went on. And it slipped over the existing 6" coupling tube to the roof perfectly. We will keep this company in mind when doing other projects, such as heating, vents, dryer etc, well worth the cost. Thank you

## Frequently Bought Together

- AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-Feet Long for Heating Cooling Ventilation and Exhaust
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-04-22*