8-Inch Professional Backdraft Damper Shutter Connector Duct

Works like it should and received just in time.

Quality device - using to vent my garage into the attic

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.

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

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.

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

the product itself was fine but the installers said it was too large. We had to return and order a smaller size to fit.

priced right, arrived fast and with excellent construcgtion.