10" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps

Does what it is supposed to do. Nice and quietly.

First of all, the item is not what is in the picture. The actual item is a lot cheaper and is definitely made in China. My first unit arrive with no damage to the Amazon box or the packaging, yet the damper flap was bent, a push nut was missing so the damper was flopping around and the foam insulator was torn up as a result. I sent it back for a replacement. The replacement arrived the same. No damage to the Amazon box or packaging, yet the damper flap was bent and stuck because the hinges were bent. I just decided to get a refund at that point. Definitely do not buy.

Tighten worm-gear ring clamps on this with caution! These are fragile and the slightest pressure will bend the damper out of shape and release the retaining springs.

The weld at the end of the rod broke in transit. Not nearly as thick and durable as the image makes it seem.