... Industrial Centrifugal Fan Axial fan, Axial Flow Fan, Fan, Ventilator, Ventilation, Ventilating Fan, Ventilation, Ventilator Fan, Ventilation, ... . This machine is mainly used as ventilation applications for coal, metal mine or ... ventilation of blind drifts at density of air up to 1.2 kg / m3, temperature from -20OC up to +35 OC, dust ... item 3.2) no more than 95· dust level of ambient air, mg/m3, no ...