Product review (5 stars): No more dryer draft!
Got this because there was a strong cold air draft from the clothes dryer this winter. Installed it during a warm spell so the caulk could cure properly. When the cold weather returned, the draft was gone! No more cold air infiltrating through joints in the dryer duct or the poor seal around the dryer door.

It was easy to install, taking about twenty minutes to remove the old flapper-type vent hood, drill holes for the mounting screws, attach this thing, and caulk all the way around it to completely seal out cold air. The best dryer vent I've ever installed.