4-72/3.6a blower fan: 1,iron steel 2,Y100L-2 motor 3, ... 3kw 4,high quality 4-72/3.6A blower fan:1.Application and characteristic*It is used for indoor ... .*It is belongs to medium pressure, big flow centrifugal fan. It’s impeller is made of retroverted wing shape ... front disc and plate back disc. The kind of fan has high efficiency ,low noise .It is sturdy and ... .The propeller:The rotation: 4-72/3.6a fan