... time 2.blades through CAD design,light weight and big wind 24'' industrial exhaust fan sizes:10'',12'',14'' 16'' 20'' 24 ... inch ,60cm 3.power:247WRPM:1200-1350r/minstrong wall, portable exhaust fan features1. motor color high-speed steel ball bearings, copper ... live longer, more powerful2. environmental protection and save energy 3.big wind and low noise Package information69*69*27cm 1pc/carton ...