FV-11VK3 WhisperGreen 110 CFM Ceiling Mounted Ventilation Fan with DC MotorProduct ReviewP Click on the link for more reviewsPBuilt-in damper to prevent backdraft, which helps to prevent outside air from coming through the fanPENERGY STAR qualified, features super-quiet operation and high CFM-to-Watt efficiencyPEnclosed DC motor designed for extremely quiet, energy-efficient operationP