Product review (5 stars): Keeps out the draft
I live in the mountains, a draft from the dryer vent made the laundry room and surrounding rooms unbearably cold in the winter. The Heartland closure did the trick. It seals the vent when not in use. Allows free flow out when the dryer is running. The vent is completly unrestricted which makes the dryer work effortlessly to dry like it should.