The Ventamatic Gable Mount Attic Fan is built to ventilate residential attic spaces up to 1 850 sq. ft. and is a great fit for situations in which roof-mounting is impractical. Constructed using a durable galvanized steel shroud and blades to resist heat distortion and paired with a mounting system engineered to minimize vibration and ensure quiet operation. Install is straightforward with easy to use mounting brackets and requires no special tools to complete. The gable vent includes a pre-wired thermostat to run the exhaust fan only when you need it minimizing its operational cost. This electric 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. WARNING: This product can expose you to chemicals including Chromium which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov - Nickel (Metallic)