Ventilation and air movement equipment, namely, air impellers for ventilation; Electric motor-driven exhaust fans, Structural parts for the aforesaid goods, in particular ventilating fan wheels, ventilating fan blades, fan wheels, fan blades, blowing machine wheels, blowing machine housings, inflow nozzles, outflow nozzles, diffuser housings; Structural fittings for electric motor-driven fans and ventilating exhaust fans, namely, screens, protective grilles, filter frames, inflow nozzles, out...