This Nutone fan will help eliminate the humidity of a hot bath or shower in your bathroom. Featuring a ventilation capacity of 50 CFM with 2.5 sones, it is designed for small to medium size bathrooms of up to 45 sq. ft. This fan comes with double-strength steel mounting flanges with keyhole slots for a quick and easy installation. It requires a 3" round duct. Backed by a 1-year warranty.