WEX sidewall fan with advanced progressive forward-swept-type blade can cut the air, curved blade smooth flowing and maintain streamlined now, in the air from the outer edge of the angle of the blades from the turbulence reduced, thereby maximizing the amount of exhaust while ensuring noise level of efficiency. Carried out during the design process of the full stress analysis, by the end of the bead reduces the amplitude of the blade to prevent the blade deformation fracture. Square housing design can be easily mounted on a concrete wall, brick wall or light steel pressure type, square rain cover solid structure, beautiful appearance. With low noise, large air volume, reliable performance, wide range of parameters, easy installation features, Direct drive motor, no wearing parts, maintenance-free. Reliable lubrication-free outer rotor type motor performance, reduce transmission losses and reduce the weight of the machine. Since the motor is placed directly in the air stream and the assurance of good heat dissipation, extending the life of the fan motor is widely used in industrial enterprises and workshops and residential and commercial building projects side wall type ventilation. According to the requirements of the transmission medium can be made corrosion, explosion-proof. EX fans are generally used for the side wall Exhaust, arranged 45 ° rain cover (or special manufacturing as 60 °) and insect nets (through the lights at night to prevent the insects flying into the shop). May need to be made Sidewall blower model WSP (WSP), arranged 90 ° Covers (wind, rain, dust) and insect nets (through the lights at night to prevent the insects flying into the shop).