WhisperCeiling 190 CFM Ceiling Mounted Fan: * Quiet operation at .25" water gauge * Continuous, trouble-free operation for many years * User-friendly installation * Built-in damper to prevent backdraft * Power consumption: 42W at 0.25" static pressure * Energy efficiency: 4.1W at 0.25" static pressure * Speed (RPM): 871 at .25" static pressure * Duct diameter: 6" * Mounting opening: 12-3/16 sq in * Grille size: 15 sq in * Weight: 17.2 lbs