Product review (4 stars): Good For Dryer Exhaust
I bought this for a dryer exhaust vent. It's made from a type of molded plastic that seems to be of a better quality than similar models (that become brittle and yellow with age). It has a hinged, circular flap that keeps out back-drafts when the dryer isn't running. It can be used with or without the plastic mesh insert that fits into the bottom of the hood. I would buy the same item again.