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. WhisperLite 150 CFM Ceiling Mounted Fan/Light Combination: * The 150 CFM Bathroom Ceiling Fans With Lights features quiet operation at .25" water gauge * Continuous, trouble-free operation for many years * User-friendly installation * The 150 CFM Bathroom Ceiling Fans With Lights has a built-in damper to prevent backdraft * 32-watt compact fluorescent lamp * 4-watt nightlight * Power consumption (watts): 31.8 at 150 CFM and 30.9 at 128 CFM * Energy efficiency (CFM"s/watts): 4.8 at 150 CFM and 4.2 at 128 CFM * Bathroom Fan Light Combo Speed (RPM): 800 at 150 CFM and 988 at 128 CFM * Duct diameter: 6" * Mounting opening: 10-1/2 sq in * Grille size: 13 sq in * Dimensions: 11.5"H x 14.17"W x 16.73"D * Weight: 13.67 lbs