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