6 Inch Backdraft Damper Back Draft Vent Duct Shutter Blocker, Backflow Ducting Insert One-Way Airflow Preventer with Inline Springs Loaded Folding Blades, HVAC Extractor Range Fan Hood Deflector

This is a good quality, well built dampener. It uses a high density foam weatherstrip on the back for the wings to rest against. This helps seal it up nicely when not in use. This is FAR better than the typical Chinese junk you see. Very happy and will recommend to all.

Works great. Nice seal and very quiet

I really like the seal inside that the dampers seat against when closed. Fits perfectly in the 4" exhaust duct. Using it to seal out outside air from entering the indoor greenhouse through the exhaust fan duct.

Arrived within a few days. Good quality. I used it to prevent backdraft in a dryer vent. The air from the adjacent bathroom fan no longer goes into the dryer.

Good price fast shipping excellent seller

I opened up my recent installation and this does not work and constantly opens up with every small breeze from the exterior. What is the point if it lets air into the house and so slow to close because of weak springs. Total waste of time and money.

esta muy bueno y util el producto

I put this on my exit exhaust vent on my portable air conditioner. It opens and closes as it should and prevents hot air from coming into the house very pleased and would recommend.

Fit perfectly to replace a broken damper

Works as described however the fit is very very tight. That is a good thing however I needed to file down the rivets of my exhaust pipe and apply a lubricant to fit the damper in

At the time was competitively priced with home Depot. Worked as expected.

Very well

The springs are a little weak, do not always return to close due to the collar not always round and it binds