24'' industrial ventilating fan 1.pure copper motor,more long life ... .blades through CAD design,light weight and big wind 24'' industrial exhaust fan sizes:10'',12'',14'' 16'' 20'' 24''dia: ... inch ,60cm 3.power:247WRPM:1200-1350r/minstrong wall, portable exhaust fan features1. motor color high-speed steel ball bearings, ... it,please contact with me,contact person:Donna Zheng 24''industrial exhaust fan