1997 Krack 2-Fan Evaporator Model: CFS2C-488-3-7.5-RBA-HGU-RH-TH. Refrigerant: recirculated R-717 (ammonia). Nominal capacity: 18.5 tons with a 10ºF TD. Coil surface area: 4,674 sq. ft. Coil volume: 9.9 cubic ft. Designed for rooms with temperatures less than 32°F. Rows: 8. Fins per inch: 4. Tube diameter: 1 in. Displacement: 31,700 cfm. (2) 25 in. diameter centrifugal blowers. (1) Baldor electric motor, 7-1/2 hp, 1725 rpm, 208-230/460 V, 21.5-20/10 amps, 60 Hz, 3 phase. Hot dipped, galvanized coil. Hot gas defrost with an insulated, hot gas drain pan. (1) 2 ft. ½ in. x 10 in. access door. Inlets: (1) 3 in. dia. port. Outlets: (1) 1 ½ in. dia. port, (2) 1 ½ in. ports (drain). Approximate weight: 6,600 lbs. Overall dimensions: 13 ft. 9 in. L x 7 ft.1 in. W x 8 ft. 11 in. H.(ACN170).(BK).