Ventilation and air-conditioning apparatus; electric motor-driven fans and ventilating fans for personal use; parts for the aforesaid goods, namely, ventilating fan wheels, ventilating fan blades, fan wheels, fan blades, inflow nozzles, outflow nozzles, fan housings; fittings for electric motor-operated fans and ventilating fans, namely, screens, protective grilles, filter frames, inlet nozzles, outlet nozzles, diffuser housings, wall rings, being parts of ventilating fans designed to attach ...