---
product_id: 747933162
title: "AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans"
brand: "ac infinity"
price: "€ 211.18"
currency: EUR
in_stock: false
reviews_count: 5
category: "Ac Infinity"
url: https://www.desertcart.pt/products/747933162-ac-infinity-8-backdraft-damper-one-way-airflow-ducting-insert
store_origin: PT
region: Portugal
---

# Spring-loaded aluminum blades for effortless airflow Rubber gaskets ensure airtight seal Galvanized steel body for durability AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans

**Brand:** ac infinity
**Price:** € 211.18
**Availability:** ❌ Out of Stock

## Summary

> 🔄 Keep your airflow flawless and your space draft-free — because comfort is non-negotiable!

## Quick Answers

- **What is this?** AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans by ac infinity
- **How much does it cost?** € 211.18 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/747933162-ac-infinity-8-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

- • **Built to Last:** Robust galvanized steel frame resists wear and tear for long-term reliability
- • **Seal the Deal:** Dual rubber gaskets create an airtight grip, blocking drafts and debris effectively
- • **Effortless Airflow:** Spring-loaded aluminum blades open with minimal airflow, maximizing ventilation efficiency
- • **Silent Performance:** Operates quietly at 59 decibels, keeping your space peaceful and fresh
- • **Versatile Installation:** Mounts horizontally or vertically to fit any ducting setup seamlessly

## Overview

The AC Infinity 8” Backdraft Damper is a premium one-way airflow duct insert designed for 8-inch ducting in range hoods, bathroom fans, and HVAC systems. Featuring a galvanized steel body with powder coat finish, spring-loaded aluminum blades that open with minimal airflow, and dual rubber gaskets for an airtight seal, it prevents backflow, drafts, and debris intrusion. Its versatile horizontal or vertical mounting and quiet operation at 59 dB make it an essential upgrade for efficient, durable, and silent ventilation.

## 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 8 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat Product Description A ventilation ducting tool designed for insertion into 8” 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, 8" Product Model AC-BDD8-B UPC Code 819137021327 Product and Mounting Dimensions Duct Opening Size 8" Product Length 7.08 in. (18.0 cm) Product Performance and Technical Specs Whole Body Material Steel Shutter Material Aluminum Color Black Finish Powder Coat

Review: Solid, heavy, well made.
Review: Nicht mal eine Anschlagsdämpfung - Das größte Außenmaß ist 206mm nicht 200mm. Die Klappen schlagen hart an und sind ungedämpft. Schöne Optik, aber mehr sicher nicht

## 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 8 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0842Y637Z |
| Blade Length | 7.08 Inches |
| Brand | AC Infinity |
| Colour | Black |
| Control Method | Touch |
| Electric fan design | Exhaust Fan |
| Finish Type | Powder Coated |
| Indoor/Outdoor Usage | Indoor |
| Installation Type | Horizontal/Vertical Mount |
| Is It Cordless? | No |
| Item Weight | 1 kg 190 g |
| Item model number | AC-BDD8-B |
| Manufacturer | AC Infinity |
| Model Name | AC-BDD6-B |
| Net Quantity | 1 Count |
| Noise Level | 59 Decibels |
| Number of Power Levels | 1 |
| Package Dimensions | 21.31 x 21.21 x 19.3 cm; 1.19 kg |
| Power Source | Electric |
| Recommended Uses For Product | Exhausting |
| Room Type | Bathroom |
| Size | 8" |
| Special Feature | Spring-Loaded |
| Specification Met | UL |
| Speed | 1500 RPM |
| Style | Modern |
| UPC | 819137021327 |
| Wattage | 75 Watts |

## Product Details

- **Brand:** AC Infinity
- **Colour:** Black
- **Controller Type:** Button Control
- **Electric fan design:** Exhaust Fan
- **Mounting Type:** Horizontal/Vertical Mount
- **Power Source:** Electric
- **Recommended Uses For Product:** Exhausting
- **Room Type:** Bathroom
- **Special Feature:** Spring-Loaded
- **Style:** Modern

## Images

![AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans - Image 1](https://m.media-amazon.com/images/I/51cQZuaUxNL.jpg)
![AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans - Image 2](https://m.media-amazon.com/images/I/51jBoph3RiL.jpg)
![AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans - Image 3](https://m.media-amazon.com/images/I/51Vig+xStqL.jpg)
![AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans - Image 4](https://m.media-amazon.com/images/I/51tmHovbmlL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can this 6" damper connect directly to the ac infinity cloudline t6 fan or it need to connect to duct first then fan?**
A: No. This has a female sized connection. The fan's diameter is for attachment of ducting. It is the SAME SIZE as the damper. A short section of duct will be needed to connect the two. Could use a 3 inch piece of 6 inch rigid duct and tape it.

**Q: How air tight is this? Is it leaky at the center hinge or does it have gaskets there?**
A: The individual butterflies do not have any sort of gaskets or seals around their mating surfaces as they're not meant to be a way of "sealing off" a section of air handling equipment in an "air-tight" sense of the phrase...BUT, I will say that.. up against comparable dampers available at any home improvement store or HVAC supply house, these are of a NOTICEABLY higher quality!  

This may sound like a sales pitch, but I assure you.. I'm nothing more than a customer who is VERY happy with their products.

AC Infinity component are like holding an Apple product!  Even their packaging just feels "premium"!   

The housing itself is very stout/heavy, made of thick (I believe) drawn metal, and not the typical thin, stamped/rolled and pinch-welded galvanized sheet metal that most others are made from.   

The damper body is strong enough that I could NOT very easily get it to flex/distort in my hands.  Obviously don't try this, as it's imperative that it stay "round" in order for the butterfly flaps to operate smoothly, but that's exactly WHY I tested that, because I wanted to see how easy it would distort when manhandled.. so I knew how delicate I needed to be with the thing while installing it, laying on my back, in my hot/cramped attic.. and I was surprised and shocked at how rigid the body of the unit actually was!

I've purchased/installed several AC Infinity 6" and 8" dampers now, and both of the HVAC pro's that I've had help me with my projects have all been shocked, and have commented about how amazed they are at just how nice ALL the AC Infinity stuff actually is once they finally take it out of the box and handle it.

It does have 2 soft rubber "o-ring" style gaskets around the outer diameter, meant to create a seal with the mating sections of pipe or hose that you slip onto either end.  

The butterflies are very light to operate, they move very smoothly, and the retraction spring gives them a satisfying positive "clunk" when they return to their closed position after you turn your unit off and the air pressure drops inside the duct.  

The butterfly sections are center hinged, and they seat up against a drawn "lip" inside of the body of the damper, so that any back flow pressure will actually push them up against this lip, and the more back pressure, the harder it will push against them making it difficult for any sort of air mass to move backwards up the system.. but as I already mentioned, it's not a submarine portal, so by no means does it create an air/water tight "hermetic" seal, but if you're only  concerned about things like air drafts during cold weather (what it's really designed for) then you won't find a nicer damper!   

Put it this way, it's not designed to be a "check-valve", or a shut-off valve, so I wouldn't try to use it to completely block-off a section of duct when not in use, or I wouldn't try to pressurize the back side of this thing with another fan, and expect it to prevent that fan's output from migrating backward/passed the damper.  

A lot of people think you can have multiple fans share a single, centralized, exhaust duct as long as you install a backdraft damper behind each fan, and that the damper will prevent the other fans from backfeeding each other.. but that's just not the case.   

It won't prevent things like gases, smoke, chemical vapor, or anything like that from entering a section of duct work when it's closed, but it will "seal" well enough to prevent cold back drafts, or the ingress of bird/insects, and it'll do a decent job at keeping your heat from escaping out your exhaust ducting when the fan is turned off and the damper is closed!

**Q: Will this work on the intake side of an ac infinity fan? i want to use this to pull air from a room and not allow the air to flow back into that room**
A: It will work on both the intake and exhaust side of the fan.  I use it as part of a room exhaust system in my setup, it blocks the backdraft of air but if will let some heat or cold radiate through the metal flaps.

**Q: will this work with non flexible duct?**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Solid, heavy, well made.
*by C***O on 7 December 2024*



### ⭐ Nicht mal eine Anschlagsdämpfung
*by T***E on 21 December 2025*

Das größte Außenmaß ist 206mm nicht 200mm. Die Klappen schlagen hart an und sind ungedämpft. Schöne Optik, aber mehr sicher nicht

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



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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-19*