Our Premium Series model is built to ventilate residential attic spaces up to 2,400 sq. ft. and is a great fit for situations in which roof-mounting is impractical. Constructed using a durable galvanized steel shroud in powder-coated blue finish, safety grille, and powder-coated blades for added durability and to resist heat distortion, and paired with a mounting system engineered to minimize vibration and ensure quiet operation. Install is straightforward using the included bracket hardware and requires no special tools to complete. The adjustable thermostat runs only when you need it, keeping your attic at a constant temperature while minimizing it's operation cost. This fan is designed to prolong the life of composition roof shingles by lowering summer attic temperatures and helps to protect attic insulation against mold and mildew in the winter by removing moisture-filled air. Install behind existing louvers or purchase our shutter model (CX2121AM), and swap your pre-wired thermostat for a thermostat/humidistat combo (XXDUOSTAT) for greater control.