FRESH SPEED 8-Inch Backdraft Damper Shutter, Galvanized Steel Duct Valve | aluminum blades, foam sealed, fits 8" AC, dryer, extractor, bath exhaust ducts, one-way valve, blocks backdraft

This worked good for me . Durable metal not cheap the fit was perfect for 6” duct. Proper airflow through it and shut as it should.

Well built. not perfect but 95% all you could ask for. Fits 6" duct nicely. Easy to install.

Works as intended with solid backdraft closure. Care should be taken when trying to crimp the metal for inserting into a 4 inch duct as to not getting the damper out of round or striking the butterfly flap inside.

I’m using this as an outside air to inside when bathroom fans are being used. Provides proper flow and closes when demand for outside air is not needed. I added a screened vent in the attic to keep unwanted visitors out if they’re up there and keep the damper clean.

smooth and quiet operation - with only light pressure to open . solid construction - 6" and not 6" duct size

Does not fit well into standard 6 inch ducting. Had to really manipulate the duct ends. The real issue is the spring tension for the shutters. Too stiff. You need significant air velocity and pressure for them to open enough. These will really reduce the airflow if you don't alter the spring and bend them to be less restrictive.

Fast delivery. Quality product. Easy installation. Fit perfectly.

Amazing! I had an issue with my neighbor’s hing and turmeric cooking smell. It kept coming down to my apartment through the kitchen exhaust and it made all my clothes so smelly. Problem solved! I don’t smell any thing coming back to my apartment.

Je l'ai installé sur la gaine 6''de ma hotte.En position basse,le clapet s'ouvre un peu.Le clapet s'ouvre a moitié en position forte car les ressorts sont assez fort mais assez pour que l'air passe.Bien construit.Par contre faut l'installer a l'horizontale car la vapeur d'eau dans le conduit va retomber sur les clapets qui gèleront en hiver bloquant leur ouverture.Donc satisfait.

Seems to work as intended. It’s very long though; it sticks out quite a bit from my wall compared to my last one (basic plastic one).

Really well put together. Healthy foam rubber seal. Responsive spring action. Sturdy. I did remove one of the small springs because the fan driving the airflow is a microwave hood fan. The flaps were still opening but I believe it helped having only one spring to push open.

Vraiment pratique, on l’a utilisé pour la sortie de sécheuse. Fini l’air froide de l’extérieur.

I just installed this at the end of a bathroom exhaust fan (where it goes out the roof) to keep the winter air out of the insulated duct (to avoid condensation). The flaps work great but shouldn't the side closer to the fan be flared out (a female side and a male side)? I'm not a licensed tin basher but air moves in one direction and sharp edges should be avoided less dust and debris accumulate there. Even if this is installed in the middle of a run, shouldn't that still be the case? The flaps only open in one direction, so what am I missing? I had to really crimp the male end of the duct to get it in there (because the male end didn't fit around the outside of the damper either). I must be missing something because they all come like that. Is it because if you are using flexible duct, you have to use a hose clamp at each end? If so, why not offer two types? I was tempted to deduct a star because of that but I'm keeping it at 5 because it is a well built and solid damper.