 It just needs to be sealed, doesn't have to be pretty, just needs to be sealed up, and then you can put that insulation back and take care of it. So if you're building a house, it's an easy thing to do. You can make sure that's sealed up and put it in there. Otherwise, you're probably going to be pulling too much air inside the house and creating a vacuum there, which now you're paying to cool the attic, and that makes no sense. So be careful with those power vent fans. Those can be problematic if not installed correctly. So that's a big one.