"Axial Fan" called local fans, industrial and mining enterprises is commonly used as a fan, security is different from the fan motor and fan it in a cylinder, the shape is a cylindrical shape, for local ventilation, easy installation , ventilation effect is obvious, safe, hairdryer lookout can be connected to the designated area. Society ventilator main operating parameters, air flow Q, determination pressure P, shaft power Pa, the speed n (to calculate the efficiency η) experiment. Characteristic curve obtained by experiments axial fan (including the P-Q curve, Pst-Q curves, N-Q curve, η-Q curve).