... , electricity equipment:Adopt teaching safety main power, with control drawer, AC and DC current of low voltage. The teacher can control ... blowing rate of the draught fan,also the total electricity power used for students( DC 2-24V, AC 220V). 4, water supply and ... , VentilationAdopt chemical resistance UPVC plastic, 6.5# rate adustable centrifugal fan (power:5.5KW, n=0~1450/min, blowing rage: 0 ...