Here Exhaust fan detail including blades , wired guard motor mount , secure fan frame to blocking , motor mount , fan frame Typically, an exhaust fan is placed in a room such as the kitchen or bathroom to remove stale, muggy or dirty air. As stated, exhaust fans work by removing unwanted odors, moisture, smoke and other pollutants in the air. When steam and moisture are in the air, it can cause mold to develop. For more details of Exhaust fan detail download this file.