11 leaves 680mm diameter open fan fan fan blade root comes with guide plate and air separator, increase the efficiency of the fan & nbsp; & nbsp; fan type & nbsp; flow to strengthen the axial flow fan & nbsp; fan maximum diameter & nbsp; 680mm fan is installed diameter & nbsp; 680mm axial fan with a total thickness of & nbsp; 92.6mm fan is installed thickness & nbsp; 92.6mm fan material thickness & nbsp; 5mm installation hole number & nbsp; 6 installation hole pitch circle diameter & nbsp; 200mm installation check the diameter of the mouth of the & nbsp; 180mm