---
product_id: 185858230
title: "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: "฿5842"
currency: THB
in_stock: true
reviews_count: 13
category: "Ac Infinity"
url: https://www.desertcart.co.th/products/185858230-8-backdraft-damper-one-way-airflow-ducting-insert-with-spring
store_origin: TH
region: Thailand
---

# Spring-loaded blades for effortless airflow Airtight rubber gasket seal Galvanized steel body for durability 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:** ฿5842
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 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?** ฿5842 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/185858230-8-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

- • **Built to Last:** Durable galvanized steel body with a sleek powder coat finish combines strength with modern style.
- • **Versatile Installation:** Mounts horizontally or vertically to fit your unique ducting setup with ease and precision.
- • **Effortless One-Way Airflow:** Spring-loaded aluminum blades open with minimal airflow, ensuring your space stays fresh without wasted energy.
- • **Perfect Fit for 8” Ducts:** Designed specifically for standard 8-inch duct openings, making upgrades and replacements hassle-free.
- • **Airtight Seal, Zero Backdraft:** Outer rubber gaskets create a secure, airtight grip to prevent unwanted drafts and debris intrusion.

## Overview

The AC Infinity 8” Backdraft Damper is a premium one-way airflow duct insert designed for range hoods and bathroom fans. Featuring a galvanized steel body, spring-loaded aluminum blades, and airtight rubber gaskets, it prevents backdrafts and debris while ensuring smooth ventilation. Its versatile mounting options and powder-coated finish make it a durable, stylish, and efficient solution for 8-inch duct systems.

## Description

Buy AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans: Ducting - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Quiet; large; spring-loaded; very well made; FINALLY WORKS - If I could give it 6 stars, I would. This is my FOURTH go around at trying to solve a backdraft problem with my kitchen vent hood. This one finally did the trick. Amazing how many bad options there are out there for a backdraft damper, never would have guessed it. The problem is that most other backdraft preventer work by closing the flap using gravity alone, and it turns out that once installed, that's not always enough - kind of random. But you can tell right away when you step in the kitchen if the flap is open or not by whether youre freezing or comfortable: Walk to the hood; put your hand under and feel for the draft; get your answer - you'll always guess it right. With this one, it's always closed and the room is always comfortable. Thank you thank you thank you!! It's also very well made (sturdy, compared to all the others) and _not_ more expensive! It's also quieter than the others. Go figure. My only complaint: it only comes in 6" or 8" dia. WTF!! A vent hood has standard 7" ductwork. I got around this by buying and installing 2 flares, one on either sides. It mates nicely with the 7", but you need to have a bit of room in the cabinet above the hood: can't have a 90deg turn too close to the hood. You won't be able to cut through the metal work to reshape it easily, unless other thin-gage dampers, which I spent hours re-shaping. Works like a charm when installed right.
Review: good buy - good product recommended

## 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 |
|---------------|-------|
| Brand | AC Infinity |
| Color | Black |
| Electric fan design | Exhaust Fan |
| Power Source | Electric |
| Room Type | Bathroom |
| Style | Modern |

## Product Details

- **Brand:** AC Infinity
- **Color:** 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

![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)

## 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

### ⭐⭐⭐⭐⭐ Quiet; large; spring-loaded; very well made; FINALLY WORKS
*by P***X on March 20, 2025*

If I could give it 6 stars, I would. This is my FOURTH go around at trying to solve a backdraft problem with my kitchen vent hood. This one finally did the trick. Amazing how many bad options there are out there for a backdraft damper, never would have guessed it. The problem is that most other backdraft preventer work by closing the flap using gravity alone, and it turns out that once installed, that's not always enough - kind of random. But you can tell right away when you step in the kitchen if the flap is open or not by whether youre freezing or comfortable: Walk to the hood; put your hand under and feel for the draft; get your answer - you'll always guess it right. With this one, it's always closed and the room is always comfortable. Thank you thank you thank you!! It's also very well made (sturdy, compared to all the others) and _not_ more expensive! It's also quieter than the others. Go figure. My only complaint: it only comes in 6" or 8" dia. WTF!! A vent hood has standard 7" ductwork. I got around this by buying and installing 2 flares, one on either sides. It mates nicely with the 7", but you need to have a bit of room in the cabinet above the hood: can't have a 90deg turn too close to the hood. You won't be able to cut through the metal work to reshape it easily, unless other thin-gage dampers, which I spent hours re-shaping. Works like a charm when installed right.

### ⭐⭐⭐⭐⭐ good buy
*by P***E on February 4, 2026*

good product recommended

### ⭐⭐⭐⭐⭐ Excellent quality
*by B***R on February 4, 2026*

Better quality than previous backdraft dampers I bought previously

## Frequently Bought Together

- AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans
- AC Infinity Flexible 8-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust
- AC Infinity Noise Reduction Clamp 8-Inch, Duct Coupler with Stainless Steel Clamps, Flexible Rubber Coupling for Inline Fans and Carbon Filters in Growing and HVAC

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.th/products/185858230-8-backdraft-damper-one-way-airflow-ducting-insert-with-spring](https://www.desertcart.co.th/products/185858230-8-backdraft-damper-one-way-airflow-ducting-insert-with-spring)

---

*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-07*