8-Inch Professional Backdraft Damper Shutter Connector Duct

Works like it should and received just in time.

Good damper with foam seal.

We have three fans in our master bath, which created an air circuit pulling either cold or muggy air into the house. Installing one of these in each duct has stopped that completely, stabilizing the temperature and humidity in the room (meaning our HVAC runs less often to compensate). As an added bonus, we didn't realize how much outside noise we could hear through those fans, but it's sure quiet now. The foam ring effectively silences the closing of the butterfly doors, so there's no closing noise when the fan turns off. Only nuisance issue is that the hinge pin sticks out enough on both ends that you can't insert this into the tapered collar end of a duct, nor can the tapered end quite fit into the ends of this fitting, so you have to cut completely through the duct to insert it. This issue is the only reason I don't give it five stars all the way around.

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.

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.

Easy to install. Works perfectly. Used as a back draft damper for my Jenn-Air slide in island stove/oven. Oven has exhaust fan vent on bottom of stove through floor to basement and ducted between floor joists to outside wall opening. Placed 6" damper in line in the flexible duct....cooking steam, smoke, etc. out the vent...cold oir, debris prevented from coming back in the house. HIGHLY RECOMMEND IT.

Quality device - using to vent my garage into the attic

The whole thing feels very sturdy. The movable damper opens easily and closes well. It creates a good seal.

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.

would give it 5 stars if it was a little longer on the exit side to be able to use sheet metal screws to attach the ducting with out interfering with damper

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

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.

The foam gasket doesn’t dampen the noise. Still clangs every time the flap closes.