... efficiency,small volume,light weight,and compact structure.Air cooling structure,pressure rise 98Kpa,no need of ... light weight and better heat-diffusing effect.Comapact unit design is applied with auto self- tensioned structure ... loading-release valve is equipped for the compact unit,which can make blower start running,and close ... ,feel free to ask me. ZYSRH150 air blower high pressure roots blower