4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector - Black
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Availability:
In Stock.
Arrives
Wednesday, May 6
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Size: 4 Inch
Color: Black
Features
- MaterialThe 4 inch backdraft damper is made of a Galvanized steel with powder coat, the flap leaves are made of aluminum
- InstallationThe backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation
- FunctionThis airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use
- Wide Application These backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applications
- NoteBack draught valves can be inserted into ventilation ducts which are flexible or non flexible. Cannot be used with plastic ducts as the sizes are different. All dimensions are measured manually, please allow 1-3mm differences
Color: Black
Brand: Kikerike
Maximum Gap Fill: 4 Inches
Number of Pieces: 1
Manufacturer: Kikerike
Brand Name: Kikerike
Manufacturer: Kikerike
Color: Black
Maximum Gap Fill: 4 Inches
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, May 6
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 6 Inch
Color: Silver
Wasnt avail at big box stores near me so I scrambled to order this for my contractor installing the ductwork for my new kitchen stove vent. He said it was perfect and easy to install. It seems to be working great and our city inspector specifically went out of his way to check it. Passed without issue. Recommended.
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Reviewed in the United States on March 27, 2026 by Chris Benson
Size: 4 Inch
Color: Silver
Perfect for my installation. Too many of these type dampers have very stiff springs and it will not work with low CFM air flows. These are great. You can blow at them with your mouth and get them to open. And they seal very well. I use them for air circulation between rooms with fans set to about 60 CFM. The last ones I got restricted about 80% of the air. These only restrict maybe 10%. This is key for low CFM situations like bath exhaust fans, for instance.
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Reviewed in the United States on January 23, 2026 by J. Alden
Size: 4 Inch
Color: Silver
pretty light weight but I think that's by design. Alum so no rust worries - very light spring action. Fit perfectly in the existing duct work. I wasn't able to use the baffle on the fan I bought for the bathroom so this was a nice alternative.
Reviewed in the United States on February 16, 2026 by bill
Size: 6 Inch
Color: Black
Pretty good. It stopped the bad backdraft I had, but the center hinge has a bit more gap than I'd like.
Reviewed in the United States on January 28, 2026 by Joe P.
Size: 4 Inch
Color: Silver
This draft blocker worked perfect. I was concerned it wouldn't fit inside my old pipe and yet have my old elbow Go over it. It works great to prevent the cold air from going down my dryer vent. I was having trouble with condensation developing on the vent and leaking on the floor. This solve that problem I would recommend it for anybody.
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Reviewed in the United States on February 4, 2026 by pumpman
Size: 4 Inch
Color: Silver
I read the lower than 3 star reviews before I purchased and I purchased anyway. Of course there was no instructions but I’m familiar with these things. This damper needs to be installed in the correct orientation. Hinged doors open to the outside. It needs to be connected to the existing 4” exhaust pipe with foil tape (ensure no leakage) on both sides with the spring hinge in a horizontal or vertical position. If you follow those simple rules this thing works great! My 50 CFM fan moved air with no issues and there is no air from the windy outside pushing back into the house. I would say that the closer you install this damper to the outside damper that is attached to your house, the better your results. I would buy this again. Correct installation is everything.
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Reviewed in the United States on January 18, 2026 by bussboy
Size: 4 Inch
Color: Silver
Great price Great product
Reviewed in the United States on February 27, 2026 by KC Chan
Size: 10 Inch
Color: Black
I used two of these with my 4x4x4 foot generator enclosure to keep my 9kw inverter generator cool when running during power outages.
Reviewed in the United States on March 6, 2026 by Tom's Product Reviews