Single & Double Arm Dock Fans helps cool hard-to-reach loading and unloading areas. Durable hinged twin-strut steel arm helps prevent sagging, extends up to 40 and folds compactly. 18 diameter high velocity fan moves 4,000 CFM with a 2-speed, 3.2 amp permanently lubricated motor. Aluminum blades help improve air circulation and are enclosed by chrome-plated wire safety guards. Adjustable friction pivot maintains position. Loading dock fan includes a heavy-duty 115V grounded cord. Meets OSHA requirements. Long-lasting baked enamel finish.