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🌬️ Seal the airflow, unlock comfort — no more drafts, just pure efficiency!
The AC Infinity 100mm Backdraft Damper is a premium one-way airflow duct insert engineered for 4-inch duct systems. Featuring a galvanized steel body with a powder-coated finish, spring-loaded aluminum blades, and dual rubber gaskets, it prevents backdrafts and debris while maintaining airtight seals. Ideal for range hoods, bathroom fans, and HVAC setups, it mounts horizontally or vertically to optimize airflow and energy efficiency.
| ASIN | B0842XSTV9 |
| Best Sellers Rank | 45,861 in DIY & Tools ( See Top 100 in DIY & Tools ) 156 in Ducting |
| Brand | AC Infinity |
| Colour | Black |
| Connector Type | Insert |
| Connector type | Insert |
| Country of Origin | China |
| Customer Reviews | 4.5 out of 5 stars 1,895 Reviews |
| Item Dimensions | 12.7 x 9.7 x 9.7 centimetres |
| Item dimensions L x W x H | 12.7 x 9.7 x 9.7 centimetres |
| Manufacturer | AC Infinity |
| Material | Alloy Steel , Aluminium |
| Model Number | AC-BDD4-B |
| Part Number | AC-BDD4-B |
| Size | 4 Inch |
| Thread Type | NPT |
| UPC | 819137021303 |
| Unit Count | 1.0 count |
M**H
Very good looking and sturdy.
Unfortunately didn't use this as the fan they sent was the wrong one and now they haven't got the one i want in stock so returned everything and got the 16 inch airlift fan instead but it was a very nice looking piece of kit and i would of been very happy to have used this.
C**S
Top bit of kit
Brilliant, sorted out the air coming into the property instantly! Felt warmer straight away, and looks very tidy and good quality. FOr the price of it as well, cant fault it at all.
C**O
Solid, heavy, well made.
Very solid unit. Walls are easily 2-3x thicker than the cheap ebay one I had before. Great design and quality.
T**E
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
A**R
Highly recommend Great Quality item
This company puts out "quality" items Something we dont see to often anymore. This item works great when exhaust fan turns on and closes nicely when fan is off. I like the rubber gasket Keeps cold air from coming back into house BigBox stores carry similar item BUT not as well made and more money Highly recommend
L**O
Precision built
This is not the first AC Infinity product I've bought. I already had an AC Infinity humidity sensing fan with a quality level that impressed me, so I decided this was the best brand when I needed a back draft baffle for my 8 inch kitchen fan exhaust. Similar build quality. You'd think this was a turbine engine part.
A**A
Very happy
Was very good as i expected to be . Was helpful for the purpose that I’m using it . In very happy with the product.
Trustpilot
3 days ago
2 weeks ago