Product review (4 stars): Looks and works great, except for the flapper
This is a very high quality vent, and I would give it 5 stars except the flap did not close all the way as some other reviewers noticed too. The quality and look are good, and the installation went smoothly. The inside flap rests against some insulation tape the manufacturer applied, but the tape isn't very smooth, and there was a gap on one side of the flap. I live where there are cold winters, so I wanted the flap to work as well as possible. I ended up using a Dremel to thin out the insulation enough to get the flap to sit almost flush with the tape, but it was not perfect. It seems like a major shortcoming in an otherwise great product. A contractor friend helped me install it, and he was also impressed with quality.