Heating, ventilating, and air conditioning and purification equipment (ambient); Air treatment equipment; HVAC systems (heating, ventilation and air conditioning); Personal heating and drying implements; Drying installations; Burners, boilers and heaters; Refrigerating and freezing equipment; Filters for industrial and household use; Flues and installations for conveying exhaust gases; Gas cleaners and purifiers; Heating apparatus; Heating apparatus and installations; Anti-fog heating devices...