Improve airflow in your attic with this 16-in. mount fan attic gable ventilator. It ventilates attics up to 1800 sq. ft. With a fan speed of 1510 RPM, it delivers an impressive airflow of 1239 CFM, enabling efficient air movement through your target location for optimal ventilation. The adjustable thermostat controls promote temperature equalization between the indoor and outdoor areas of your attic.