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 110 CFM Ceiling Mounted Fan/Light Combination: * Quiet operation at .25" water gauge * Continuous, trouble-free operation for many years * User-friendly installation * Built-in damper on the 0.5 sone APPA11VQL5 Panasonic Fan-Light to prevent backdraft * 32-watt compact fluorescent lamp * 4-watt nightlight * Power consumption (watts): 23.4 at 110 CFM and 23 at 90 CFM * Energy efficiency (CFM"s/watts): 4.7 at 110 CFM and 3.9 at 90 CFM * 0.5 sone APPA11VQL5 Panasonic Fan-Light Speed (RPM): 1006 at 110 CFM and 1193 at 90 CFM * Duct diameter: 4" * Mounting opening: 10-1/2 sq in * Grille size: 13 sq in * Panasonic 110 CFM Dimensions: 11.5"H x 14.17"W x 16.73"D * Weight: 12.57 lbs