The GAF Master Flow 4500 CFM 24 in. Direct Drive Whole-House Fan is a smart energy saver for any home in a climate where air conditioning costs are a concern. It allows you to beat the heat by forcing hot air out of your home through your attic space while bringing in cooler outside air through your windows and doors. This unit comes with a white shutter and features a low-vibration, direct drive mechanism for reliable performance. A minimum 1100 sq. ft. of attic space with a minimum of 1008 sq. in. of net free area attic exhaust is required for proper operation. Direct drive motor with included 2-speed pull chain operation Maximum house size for optimum performance: 2500 sq. ft. Powerfully moves air at a rate of up to 4500 CFM 1/4 HP permanent split-capacitor motor helps move hot air out of your home Direct drive motor design offers low vibration 2-speed pull chain switch control for easy operation Includes automatic ceiling shutter in white Can be installed with no joist cutting UL/UL Canada listed Specifications Airflow (CFM): 4500 Amperage (amps): 2.3 Color Family: Metallic Color/Finish: White Decibel (Sound) Rating: 01-Not Measured Drive Type: Direct Drive Features: Speed Control Horsepower (hp): 1/4 Intake/Exhaust: Exhaust Material: Galvanized Steel Motor Speed (RPM): 825 Mounting Position: Ceiling Product Weight (lb): 36 Returnable: 60-Day Voltage (volts):120 Coverage Area (SqFt): 2500 Cut-Out Width (in): 27.25 in Net-Free Area (Sq In): 1008 Product Depth (in): 31.5 Product Height (in): 9 Product Width (in): 30.5