The Cool Attic CX242DDWTUPS is a 24" direct drive whole house fan delivering 2985 CFM of airflow. Unit measures 28.5"W x 28.5"D x 11"H. Direct drive motor design for quieter operation and lower maintenance compared to belt-drive fans. Ideal for homes in Colorado's climate to pull cool evening air through the house and exhaust heat through the attic, reducing air conditioning costs. In original box, like-new condition. Professional installation recommended.