Axial industrial wall fans of the OV series are designed for ventilation of various rooms where a high air flow with relatively low resistance of the ventilation system is required. The cover and propeller of the fans are made of steel and coated with a polymer protective layer. The box with the terminal strip is attached to the front grille of the fan. The propeller is driven by a two-, four- or six-pole single- or three-phase asynchronous motor with built-in thermal fuse. Ball bearings guarantee a fan service life of up to 40,000 hours of continuous operation. A speed controller can be used for step-by-step or continuous control. The fans are fastened with screws in a circular hole in the wall.