... house fanThe fan blade is stainless steel , big air volume, without distortion, no broken, attractive and durable. (adopting aluminum fan blade in the ... Variety sizes of shape and install conveniently.Size of shape(blade): 620mm(24″),780mm(30″),830mm(32″),900mm(35″),1000mm ... class: IP55, insulation class: F grade.C.High strength blade impeller and pulley are made of aluminum magnesium alloy ,light ...