ENERGY STAR® Products that are ENERGY STAR-qualified prevent greenhouse gas emissions by meeting strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy. The ENERGY STAR name and marks are registered marks owned by the U.S. government, as part of their energy efficiency and environmental activities. WhisperValue 100 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): 36.4 at 100 CFM and 36.1 at 90 CFM * Panasonic Ventilation Fan Energy efficiency (CFM"s/watts): 2.9 at 100 CFM and 2.7 at 90 CFM * Speed (RPM): 840 at 100 CFM and 979 at 90 CFM * Mounting opening: 10-7/8 sq in * Grille size: 13 sq in * Panasonic Whisper Fan, 100CFM Gross weight: 9.9 lbs