WhisperFit 80 CFM Low Profile Ceiling Mounted Fan: * Low-profile housing for smaller ceiling cavities * The Panasonic Ceiling Mounted Fan is so quiet you might not know it"s on * Continuous, trouble-free operation for many years * User-friendly installation * Power consumption (watts): 4" duct: (24.5 at 0.1" static pressure, 24.3 at 0.25" static pressure), 3" duct: (24.3 at 0.1" static pressure, 24.0 at 0.25" static pressure) * Energy efficiency (CFM"s/watts): 4" duct: (3.3 at 0.1" static pressure, 2.5 at 0.25" static pressure), 3" duct: (2.9 at 0.1" static pressure, 2.2 at 0.25" static pressure) * Speed (RPM): 4" duct: (757 at 0.1" static pressure, 956 at 0.25" static pressure), 3" duct: (845 at 0.1" static pressure, 1007 at 0.25" static pressure) * Duct diameter: 4" (3" with adapter) * Mounting opening: 10-7/8 sq in * Dimensions: 5-5/8"H x 10-1/4"W x 10-1/4"D * Weight: 11.24 lbs