operating vacuum 0.667 mbar heating rated 18 KW nominal, vacuum pump 0.75 KW 3/50/415 volt Drying chamber 610mm diameter x 1065mm deep Drying chamber heated by electric elements spaced equally on exterior of chamber Unit with (4) Busch single stage rotary vane vacuum pump. Model R-5. Built-on controls consisting of: start/stop button for heating and vacuum pump, temperature controller, temperature safety trip, pressure gauge. Unit fully enclosed in cabinet.