It’s in our landing area (the top of the stairs if that makes more sense). It has a 12” hole, and in the loft/attic is a big fan with filters and a hose that makes it look like an elephant’s head. There’s a remote in our bedroom, and it creates a positive pressure in the whole house, so would certainly help your humidity issues. The brand we bought is Nuaire Drimaster, and it honestly works. We’ve had it for several years and swear by it.