Whether you want a bathroom exhaust fan replaced or a new one installed they too come in a variety of shapes, sizes, and quietness. They do make replacement exhaust fan kits where you get a new motor and grill, but if you're trying to remove the steam build-up you will need to upgrade your exhaust fan. Depending on the size of the bathroom normally dictates if you need a 50, 80 or 110 cfm exhaust fan. Of course, we also need to consider fresh air intake to ensure the fan can exhaust all the air it's capable of drawing.