The Panasonic WhisperGreen FV-13VKM3 Ceiling Mount Bathroom Fan - ENERGY STAR is a DC motor incorporated residential fan that ensures extremely quiet and energy efficient operation. It features a built-in damper that makes sure the outside air does not enter the room. Its SmartAction motion sensor senses the presence of people in the room and automatically activates the fan. The adjustable mount brackets and uncomplicated wiring make it user-friendly.