Direct Drive Fan Dimension – High-Velocity 3 Speed Portable Fan is of opening size 29 x 10 x 31 inches. It has 2 convenient handles on the top for portability, nonskid positioning legs with castors, aluminum blades, 3-speed setting rotary switch on the back housing.Use only in a dry, non-humid environment，better use indoor. Do not use under the voltage exceed its max allowable voltage 120V.