... Be used for ventilation and air the laboratory T35 axial fan types: according to impeller diametar,could divided to NO ... block,movie theater .so on Explosion proof Axial Flow Fan Type BT35-11Application1,Designed forExplosive atmosphere Zone 1, Zone 22 ... ,Designed forGroups IIA,IIB,Temperature classes T1~T43,Designed for sites with explosive atmosphere, such as petroleum exploitation, refinery, storage ...