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

Great product. Easy install works great

This damper worked perfectly to solved my problem. It is quiet and installation was simple

Strong. It opens easily with very slight pressure. Closes quickly and seals up great. It actually slides inside the pipe snugly, which is great, because your pipe length does not change. Very impressed. It is also whisper quiet when it opens or closes.

The flaps would rub against the bottom of the damper. I wrapped a paper clip around the bottom part of the rod to make a washer and cut off the excess. This raised the flaps high enough so they no longer rubbed. The damper must be installed with the flaps oriented vertically (like a door). When connecting the damper to the duct work, the crimped end off the existing duct will not fit into the damper so the crimp needs to be cut off and the damper will slide into the duct. When installing a sheet metal screw, there's no issue on the supply side but on the exhaust side the screw must be either at top dead center or bottom dead center so it will not interfere with the flaps opening. Once installed, the damper worked great and stopped the cold outside air from entering the stove exhaust.

I bought this to help seal the outside.I kept having a draft come in and making the kitchen cold. Size is perfect!Airflow is controlled.Great value since I can keep electric down.

Why did you pick this product vs others?:I had to replace the fan on my kitchen vent. There was no damper on the original vent so air just came in and out at will. Not good. This fit my 8 inch vent perfectly. When I turn on the fan I installed, it opens up perfectly. Highly recommend.

Very thin material. Hope will last some time.

I had a high volume of backdraft coming out of my over the range microwave making the kitchen 12 degrees colder than the rest of the house when it gets cold. I played with the baffle that came with the microwave, which involves taking down the microwave each time, bouncing between allowing it to work but really not stopping any backdraft to it getting stuck preventing any stove venting getting through. If I had bought this 17 dollar (6in black) item before this last cold spell I would have saved hundreds of dollars on heating. Everything is quality with this. For such thin (lighter is better) sheet metal the vanes are perfectly flat and square making full contact with the generous gasket keeping all air out of the house. The lowest setting on the vent fully opens the vanes. Even the paint job, where only a 1/4" section can be seen when installed, looks high quality. Easy to install just pop off the vent cap outside, drop this in to the vent pipe (I then duct taped it because I didn't by a clamp) then tighten the vent cap back on to the other half of this.