... feel free to ask me.1.ZYSR series roots blower applicationsZYSR series roots blower widely used in electricity,petroleum,steel industry,smelling ... making,aquaculture,sewage treatment,pneumatic conveying,etc2.Three lobes roots blower major specifications Bore:50-200mm Air Capacity:0.8- ... speed:740-2130rpm3.Free charge Standard Accessories all the blower are compact unit include Common Base ,V-belt cover ...