The Grainger 14F530 is a 14-inch diameter, 530 CFM, direct drive upblast roof exhaust fan. It features a 1/6 HP, 115V motor with permanently lubricated ball bearings and automatic thermal overload protection. The housing is constructed of heavy gauge aluminum with a spun aluminum venturi for maximum airflow. It comes with a backdraft damper to prevent reverse airflow and has curb cap mounting. This powerful roof ventilator is ideal for exhausting stale, humid air from commercial and industrial facilities.