... noise 3,Low energy consumption 4,Long service life industrial electric fanThe fan blade is stainless steel , big air volume, without ... distortion, no broken, attractive and durable. (adopting aluminum fan blade in the past, which had some problems caused after ... and install conveniently.Size of shape(blade): 620mm(24″),780mm(30″),830mm(32″),900mm(35″),1000mm(39″),1100mm(43″),1220mm(48 ...