Extremely quiet performance at very low energy consumption Designed to provide fresher and cleaner bathrooms SA-50D is the most quietest fan in the market place (0.1 Sones) Plug-in type Energy Efficient PSC Motor – designed for continuous operation Attractive modern designed plastic grille matches with any decor Painted Black Steel Housing External Electrical Junction Box for easy wiring Plastic double wheel for extremely quiet & efficient performance 4″ Round Backdraft Damper & Mounting Brackets are included HVI, and UL Listed Suitable for installation over Bathtub or Shower Stall with GFCI protected branch circuit Manufactured in ISO 9000 facility One year's warranty.