Electric Chain Hoist Duty Classification H4 Mount Type Motorized Trolley Maximum Lifting Capacity 20 000 lb Number of Speeds 2 Programmable Programmable by VFD Fixed Lift Speed Not Applicable Minimum Lift Speed 3.5 fpm Maximum Lift Speed 11 fpm Trolley Speed 40 fpm Maximum Lifting Length 20 ft Current at Minimum Voltage 17.3 A Current at Maximum Voltage 1.7 A Motor Horsepower 4 3/4 hp Operating Voltage 460V AC Headroom 46 1/2 in For Minimum Beam Height 6 29/32 in