This Super wall fan has create an air velocity of 1, 800 CFM. 3 speed high-torque, permanently lubricated motor with 3-speed rotary switches help you for different airflow. Thanks to the ball-bearing motors, these floor fans can run at least years under good caring. Reinforced wire grill for added safety. All-metal construction with aluminum blades make these fans as a good choice at workshops, basements, living rooms and garages. Use only in a dry, non-humid environment，better use indoor. Do not use under the voltage exceed its max allowable voltage 120V.