T4-72 Centrifugal fan/ ventilator

T4-72 centrifugal fans  can convey air and other unnatural but harmless ,non-corrosive gas.No adhesive matters are allowded.The hard granulated dust should be less than 150mg/m3.The temperature of the air should be less than 80 deg C.The fans are used in factory and buildings to exhaust air.It can both supply air and exhaust air.