 Now, building code used to allow in many areas if you had a window, but nobody would open the window up in the summer because it was too hot or it was too cold in the wintertime, depending on where you're located, and it could actually put in as much humidity. So you really want to have this bath fan working well. And my favorite brand is Panasonic out there. I think they make the best fans. I swapped out a Panasonic and put in a Brough Newton one, and the Panasonic did a better job and was quieter.