AC axial fan 630mm 1.impeller made of cold rolled steel 2.Ball bearing 3.replacement of thermal protector 4.CCC,CE approval AC axial fan 630mm ( 180,190,200,250,290,360,400,430,450,500,560,630,710,800mm series could also be available)1.impeller made of cold rolled steel2.Ball bearing3.replacement of thermal protector4.CCC,CE approval Perfomance curve: