* This Series Centrifugal Fan Box is a newly developed double functions backwords centrifugal fan box with advanced technology. Its impeller consists of 24 pieces of backwords welded blades.It has features as large air volume, high pressure, long use life，its life 100% longer than that with multi-vaned type fan.It adopts silencer sponges, silencer cloth, perforated plate etc to low down the noise.

* This series fan box have two types Type A (motor outs(de) used for fire fighting and smoke exhausting; Type B (Motor inside) mainly used for air exhausting or supply·

* It is widely used for fire fighting and smoke exhausting, ventilating and air exchanging for hotels, restaurants, entertainment places, buildings, supermarkets, office blocks, etc.