... steel, SUS#201 OR 304, GalvalumeExternal dimension:915x610mm Hepa filter size: 915x610mmEfficency:99.995% 0.3umAir velocity: 0.35 ... sets on fan operation, speed, working condition.2.HEPA filter for ULPA filter3.Circular duct interface4.Pre filter5.Pressure ... 50Hz;AC110V/60HzNoise(dB)52525253OptionalControl panel, Remote control, Pre filter, Pressure gaugeWeight(KG)22242832 H14 HEPA cleanroom FFU