---
product_id: 497238403
title: "100mm Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 100mm Ducting in Range Hoods and Bathrooms Fans, 4-Inch"
brand: "ac infinity"
price: "A$62"
currency: AUD
in_stock: false
reviews_count: 5
category: "Ac Infinity"
url: https://www.desertcart.com.au/products/497238403-100mm-backdraft-damper-one-way-airflow-ducting-insert-with-spring
store_origin: AU
region: Australia
---

# Spring-loaded aluminum blades for effortless airflow Rubber gaskets ensure airtight, secure seal Galvanized steel body for durability 100mm Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 100mm Ducting in Range Hoods and Bathrooms Fans, 4-Inch

**Brand:** ac infinity
**Price:** A$62
**Availability:** ❌ Out of Stock

## Summary

> 🔄 Keep your airflow flawless and your space draft-free with style!

## Quick Answers

- **What is this?** 100mm Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 100mm Ducting in Range Hoods and Bathrooms Fans, 4-Inch by ac infinity
- **How much does it cost?** A$62 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/497238403-100mm-backdraft-damper-one-way-airflow-ducting-insert-with-spring)

## 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

- • **Universal 4-Inch Fit:** Designed to snugly fit standard 4-inch duct openings for versatile HVAC applications.
- • **Durable & Sleek Build:** Galvanized steel body with powder coat finish ensures long-lasting performance and modern aesthetics.
- • **Airtight Seal Technology:** Dual rubber gaskets create a secure, airtight grip to block cold drafts and debris effectively.
- • **Flexible Mounting Options:** Mount horizontally or vertically to suit your ducting setup without compromising function.
- • **Effortless One-Way Airflow:** Spring-loaded blades open with minimal airflow, preventing backdrafts seamlessly.

## Overview

The AC Infinity 100mm Backdraft Damper is a premium duct insert engineered for 4-inch HVAC systems, featuring a galvanized steel body and spring-loaded aluminum blades that open with minimal airflow. Its dual rubber gaskets provide an airtight seal, preventing backdrafts, debris, and cold air intrusion. Designed for versatile horizontal or vertical mounting, this durable, powder-coated damper is ideal for range hoods, bathroom fans, and other ventilation needs, ensuring efficient airflow control and enhanced home comfort.

## Description

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 Product Description A ventilation ducting tool designed for insertion into 4” ducting to prevent cold drafts and debris from flowing into ventilation systems. Built to be embedded in ducts, the backdraft damper is made of sturdy galvanized steel and features two rings of outer rubber gaskets. This enables it to grip your ducting with an airtight seal in either a horizontal or vertical orientation. The butterfly damper blades are made of aluminum and are equipped with a light spring that folds with minimal airflow. Applications The spring-loaded antidraft damper is built for heavy-duty performance in applications like overhead range hoods in kitchens, bathroom fans and tumble dryers. It can be fully or partially inserted into your duct work using the rubber rings to hold itself in place. Other one-way airflow uses include keep pilot lights burning in water heaters and keeping debris from entering inline duct fans in grow tents. Product Identification Manufacturer AC Infinity Inc. Product Name Backdraft Damper, 4" Product Model AC-BDD4-B UPC Code 819137021303 Product and Mounting Dimensions Duct Opening Size 4" Product Length 5.03 in. (12.8 cm) Product Performance and Technical Specs Whole Body Material Steel Shutter Material Aluminum Color Black Finish Powder Coat

Review: Highly recommend Great Quality item
Review: Tight seal and quality construction

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 128,639 in DIY & Tools ( See Top 100 in DIY & Tools ) 402 in Ducting |
| Customer Reviews | 4.5 4.5 out of 5 stars (530) |
| Date First Available | 10 Dec. 2022 |
| Item Package Quantity | 1 |
| Item Weight | 318 g |
| Item model number | AC-BDD4-B |
| Manufacturer | AC Infinity |
| Part Number | AC-BDD4-B |
| Product Dimensions | 12.7 x 9.68 x 9.68 cm; 318 g |
| Size | 4 Inch |

## Images

![100mm Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 100mm Ducting in Range Hoods and Bathrooms Fans, 4-Inch - Image 1](https://m.media-amazon.com/images/I/51lALiYTYEL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Highly recommend Great Quality item
*by A***R on 8 March 2025*



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



### ⭐ Cool, ja aber doch nein 🤷🏻‍♂️
*by S***. on 11 February 2026*

Eigentlich ganz cool gedacht aber trotzdem unnütz. Selbst mit ne‘n 150 Rohrventilator der knapp 700m3/h schafft öffnen sich die Klappen nicht vollständig. Mit meinem 100er der nur 360m3/h Is die Öffnung Max 1cm auf bei voller Leistung. Den Geruch hält es leider auch nicht zurück da keine Gummi Lippe vorhanden ist die den Geruch eventuell drin lässt also Geldverschwendung.

## 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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**Shop now:** [https://www.desertcart.com.au/products/497238403-100mm-backdraft-damper-one-way-airflow-ducting-insert-with-spring](https://www.desertcart.com.au/products/497238403-100mm-backdraft-damper-one-way-airflow-ducting-insert-with-spring)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-11*