--- product_id: 185858230 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: "NT$3214" currency: TWD in_stock: true reviews_count: 13 category: "Ac Infinity" url: https://www.desertcart.tw/products/185858230-ac-infinity-8-backdraft-damper-one-way-airflow-ducting-insert store_origin: TW region: Taiwan --- # Fits 8-inch ducts precisely Spring-loaded aluminum blades Airtight rubber gasket seal 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:** NT$3214 **Availability:** ✅ In 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?** NT$3214 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/185858230-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 - • **Precision Fit for 8" Ducts:** Seamlessly integrates with standard HVAC systems for hassle-free installation. - • **Versatile Mounting Options:** Mount horizontally or vertically to suit any ducting layout. - • **Airtight Rubber Gasket Seal:** Prevents unwanted drafts, bugs, and debris from invading your space. - • **Spring-Loaded Aluminum Blades:** Ensures one-way airflow with minimal resistance for optimal ventilation. - • **Durable Powder-Coated Alloy Steel:** Built to last with corrosion-resistant finish for long-term reliability. ## Overview The AC Infinity 8” Backdraft Damper is a high-quality, spring-loaded duct insert designed for 8-inch HVAC ducts. Featuring an airtight rubber gasket and powder-coated alloy steel construction, it prevents backflow, drafts, and debris from entering your ventilation system. Easy to install horizontally or vertically, it ensures efficient one-way airflow for range hoods, bathroom fans, and other home ventilation applications. ## 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: Tools & Home Improvement - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Great quality and did the job - AC Infinity stuff is always great, this is no exception. I’ve got two of these hooked up in the attic so I can run two exhaust fans to one outlook. They lit the air flow freely, but only in the direction I want. Allows me to pass code! Nice product, easy install and since it’s in the attic no perceived noise inside (I don’t know if it’s load next to it). Good value! 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 8 in. Duct Openings | Product Length: 5.03 inches | Finish: Powder Coat ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0842Y637Z | | Additional Features | Spring-Loaded | | Best Sellers Rank | #13,315 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #19 in HVAC Ducting | | Brand | AC Infinity | | Brand Name | AC Infinity | | Color | Black | | Control Method | Touch | | Customer Reviews | 4.6 out of 5 stars 2,029 Reviews | | Filter Type | Baffle | | Finish Type | Powder Coated | | Finish Types | Powder Coated | | Included Components | Damper | | Item Dimensions D x W x H | 5.03"D x 5.03"W x 7.08"H | | Item Form | Insert | | Manufacturer | AC Infinity | | Manufacturer Part Number | AC-BDD8-B | | Material | Alloy Steel , Aluminum | | Material Type | Alloy Steel, Aluminum | | Model Number | AC-BDD8-B | | Mounting Type | Horizontal/Vertical Mount | | Noise | 59 Decibels | | Product Dimensions | 5.03"D x 5.03"W x 7.08"H | | Smart Home Compatibility | Not Smart Home Compatible | | Special Feature | Spring-Loaded | | Specification Met | UL | | UPC | 819137021327 | | Unit Count | 1 Count | | Vent Hood Design | Range Insert Hood | | Ventilation Type | Ducted/Vented | | Wattage | 75 watts | ## Product Details - **Brand:** AC Infinity - **Color:** Black - **Finish Type:** Powder Coated - **Material:** Alloy Steel, Aluminum - **Special Feature:** Spring-Loaded ## 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) ## 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 ### ⭐⭐⭐⭐⭐ Great quality and did the job *by J***R on May 24, 2026* AC Infinity stuff is always great, this is no exception. I’ve got two of these hooked up in the attic so I can run two exhaust fans to one outlook. They lit the air flow freely, but only in the direction I want. Allows me to pass code! Nice product, easy install and since it’s in the attic no perceived noise inside (I don’t know if it’s load next to it). Good value! ### ⭐⭐⭐⭐⭐ 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 ### ⭐⭐⭐⭐⭐ 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! ## 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.tw/products/185858230-ac-infinity-8-backdraft-damper-one-way-airflow-ducting-insert](https://www.desertcart.tw/products/185858230-ac-infinity-8-backdraft-damper-one-way-airflow-ducting-insert) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-07-15*