8 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector

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.

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.

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.

Pretty good. It stopped the bad backdraft I had, but the center hinge has a bit more gap than I'd like.

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.

Excellent quality, good price, and easy installation.

Each time the A/C or furnace kicked on it would draw outside air in through the vent hood. Cold in the winter and hot in the summer. The temperature under the hood was significant and very noticeable. So I installed this draft blocker in the pipe in the attic, separating the pipe at a joint inserting the valve and reconnecting the pipes. I seal the joints with aluminum tape. The draft blocker has a weather strip inside sealing it when not in use. I did have to reseal the pipe where it passed through the roof with roof tar to restore the water seal. It works great, the is no back draft now when the A/C is running and made a huge difference. I would recommend and buy again.

I used two of these with my 4x4x4 foot generator enclosure to keep my 9kw inverter generator cool when running during power outages.

it works very well...no more cold air in my kitchen.

Perfect fit. Flap works nicely

Awesome little Backdraft pipe 4-in adapter even has a little bit of air support so it doesn't push through the cracks with the liner inside the pipe

I used this to keep the cold from coming into the house throught the dryer vent. It works great, and was easy to install. It has a foam seal instead of the hard rubber ring that another one I purchased on Amazon at almost double the price had (I returned that one because I could see daylight between the flaps and the rubber "gasket"). I deducted a point because the foam seal was not installed accurately, but Iwas able to adjust it fairly easily. The manufacturer need to take more care assembling these, as the whole point is to not have cold air leak padt it.

Good price, seem decent quality, springs haven't jammed yet