Product review (1 stars): Leaks air like using nothing at all
First I'll say that I am very happy these boxes exist. I love using them. That being said this box is no better than any other. Same old cheap crap in a different form. I have no idea why these manufacturers cannot add gaskets or silicone rings to these things! I'd be willing to pay 10 dollars more if there was a gasket on the outside of the inlet and outlet, around the closer (door) and on the inside of the little lid. These things leak air like crazy. I use thin foil heat tape and wrap every possible area that might leak. The zip ties do nothing, there is nowhere for them to grip to. There is no lip to keep it from sliding off. Taped that too. The door that swings with the adjuster leaks air too. It's fine in the winter. Horrible in the summer. I also had to tape over the screen and around the lid to seal it. I'll just remove the tape for winter.

I spent 40 minutes taping and testing. It's on and working like it should but one should not have to put so much time and effort into such a simple contraption. I do recommend these boxes but you have to have realistic expectations. It's not going to work without lots of fuss.