WhisperValue 50 CFM Super Low Profile Ventilation Fan: * Ideal for remodeling and manufactured structured homes * Technology that boots performance * Super low profile housing design * Power consumption (watts): 15.8 at 50 CFM and 15.3 at 37 CFM * Energy efficiency (CFM"s/watts): 3.2 at 50 CFM and 2.4 at 37 CFM * Speed (RPM): 759 at 50 CFM and 948 at 37 CFM * Mounting opening: 10-7/8 sq in * Grille size: 13 sq in * Gross weight: 9.7 lbs