I was searching for an in-window fan to turn on when I'm cooking smelly foods, when people smoke in the place, etc.  I had previously had the more standard dual 8" window fan setup, and after several months of use, they always seem to get so weak they barely move air. I decided to try this one but it's not right for my intended use. This is designed to be more permanently mounted with screws/brackets, is giant, and moves a TON of air. It will pull a major vacuum and requires an open window or door. When it's off, the screen/gaps are so large taht bugs can just fly right in the house etc.  Perhaps I should have done more research before purchasing it, but hopefully this helps anyone else in my position who's in the market.