... .High efficiency, low consumption 2.Low noise compact form Discharging dust centrifugal Fan for Chemicals company Axial fan, Axial Flow Fan ... .2 kg / m3, temperature from -20OC up to +35 OC, dust level up to 50 mg/m3 and relative humidity up ... , (GOST 15150-69 item 3.2) no more than 95· dust level of ambient air, mg/m3, no more than 50 ...