031-03100 AIR CONDITIONING, HEATING, AND VENTILATING EQUIPMENT, PARTS AND ACCESSORIES | 031-03102 AIR CONDITIONING UNITS, PORTABLE OR ROOM AC UNITS, COMPUTER ROOMS, HOSPITAL ROOMS, SPORTING EVENTS, ETC. | 031-03106 AIR CONDITIONING AND HEATING CENTRAL AIR SYSTEMS, INCLUDING PARTS AND ACCESSORIES, (NOT OTHERWISE CLASSIFIED) | 031-03117 COILS, CHILLED OR HEATED WATER, AND DIRECT EXPANSION | 031-03118 Coil And Fan Units, Air Conditioning | 031-03144 FILTERS, AIR CONDITIONING AND FURNACE, PERMANENT TYPE | 031-03145 FILTERS, AIR CONDITIONING AND FURNACE, DISPOSABLE TYPE | 110-11082 V-Belts, Industrial | 150-15046 Louvers (See Class 031 For Air Conditioning) | 290-29020 Solar Air Conditioning Systems And Accessories: Absorption Type, Etc. | 559-55905 AIR CONDITIONING, HEATING AND VENTILATION, INCLUDING DEFROSTERS AND DEFOGGERS | 635-63520 Filter Pads, Paint Arrester | 820-82036 Coils, Steam Heating | 885-88508 Activated Carbon And Filter Elements | 910-91036 HEATING, AIR CONDITIONING, AND VENTILATION MAINTENANCE, REPAIR AND INSTALLATION SERVICES | 998-99852 Heating, Air Conditioning, Ventilating & Refrigeration Equipment | C-01720 SUPPLIER - PLUMBING