THERMOTRON Walk-In temperature humidity chamber MODEL WS-840-CHM-10. Welded one-piece construction. Stainless steel inteior. Approximate interior size is 8' X12' with a 6' wide X 7' tall door opening. Temperature Range: -32C to 120C Humidity Range: 35% to 95% Ramp Rate - 2C per minute Thermotron 7800 Programable Controller Refrigeration: Each box utilizes one 10 HP single stage compressors using R-507 refrigerant. Year Built - 2001 Units has very little use and in perfect condition Sytem only sold as a pair. One single steam generator feeds both chambers. Voltage: 460 volts / 60 hz / 50 amps each, does not include steam generator. Dry air purge - not integral, air supply must come from anther source. Syems has flow gauge and computer controlled electrically operated selenoid.