Air-conditioning apparatus washing services; Air-conditioning system installation and repair; Installation and repair of air-conditioning apparatus; Installation and repair of air-conditioning systems; Installation and repair of heating, ventilating and air-conditioning systems; Installation of air-conditioning apparatus; Installation of air-conditioning apparatus for use in clean rooms; Installation of air-conditioning systems; Installation of ventilating apparatus; Installation of ventilation and dust extraction systems; Installation of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Installation of heating, ventilation and air-conditioning systems; Installation, maintenance and repair of air-conditioning apparatus; Installation, maintenance and repair of air-conditioning systems; Installation, maintenance and repair of ventilating apparatus; Installation, maintenance and repair of ventilating systems; Installation, maintenance and repair of automatic apparatus for opening and closing ventilation flaps; Installation, maintenance and repair of automatic apparatus for opening and closing windows, fanlights, skylights and ventilation flaps; Installation, maintenance and repair of mechanically operated apparatus for opening and closing ventilation flaps; Maintenance and repair of air-conditioning apparatus; Maintenance and repair of ventilating apparatus; Providing information relating to the repair or maintenance of air-conditioning apparatus; Provision of information relating to the repair or maintenance of air-conditioning apparatus; Repair and maintenance of air-conditioning apparatus; Repair and maintenance of ventilating apparatus; Repair of air-conditioning apparatus; Repair or maintenance of air-conditioning apparatus