... through CAD design,light weight and big wind 24'' industrial exhaust fan sizes:10'',12'',14'' 16'' 20'' 24''dia:25cm,30cm ... inch ,60cm 3.power:247WRPM:1200-1350r/minstrong wall, portable exhaust fan features1. motor color high-speed steel ball bearings, copper enameled ... ,please contact with me,contact person:Donna Zheng 24''industrial exhaust fan