Product review (5 stars): No more cold dryer!
Absolutely prevents drafts back into your dryer. After moving from an old-school slatted vent cover to this my laundry is no longer freezing cold after a few minutes in the dryer during the winter. Installation took me 30 minutes and that included caulking around the base. I'm not sure what the payback period is on this but the comfort of knowing your vent is well-sealed and your laundry is warm makes this well worth the low price of entry.