Exclusive dual sensor technology Built-in smartaction motion sensor automatically turns on when you enter the room. Quiet operation at .25 water gauge Energy star-qualified for energy savings User-friendly installation Tired of cold air coming through your ventilation fanBlower Wheel Type: Sirocco CALGreen Compliant: Yes California Title 24 Compliant: Yes Delay Off Timer: Yes Duct Diameter (inches): 4 or 6 ENERGY STAR Qualified: Yes Grille Size (inches sq.): 13 Humidity Sensor: Yes Mfg in ISO 9001 Certified Facility: Yes Motor Type: Condenser Mounting Opening (inches sq.): 10.5 SmartAction Motion Sensor: Yes Thermal Fuse Protection: Yes Type of Motor: Bearing Ball UL tub Shower Enclosure: Yes Washington VIAQ Code: Yes