... to NO.2.8, 3.15, 3.55, 4, 4.5, 5, 5.6, 6.3, 7 ... .so on Explosion proof Axial Flow Fan Type BT35-11Application1,Designed forExplosive atmosphere Zone 1 ... different requirements.4,Impeller installation using symmetrical type to ventilate in two sides at different ... flexible installation: Bracket type, Pipe line type, Post type, Fixed type.7,According to the user require to choose impeller velocity( ...