031 AIR CONDITIONING, HEATING, AND VENTILATING: EQUIPMENT, PARTS AND ACCESSORIES (SEE RELATED ITEMS IN CLASS 740) 03103 * Air Conditioners: Commercial, and Parts and Accessories not Individually Itemized 03104 * Air Conditioners: Controlled Environment (For Computer Rooms, etc.), and Parts and Accessories not Individually Itemized) 03105 * Air Conditioners (Cooling and Cooling/Heating Types): Window and Wall Mounted, and Parts and Accessories Not Individually Itemized 03106 * Air Conditioning and Heating: Central Units, and Parts and Accessories Not Individually Itemized 03108 * Air Doors and Curtains 03109 * Air Flow Meters 03110 * Air Purifiers, Accessories and Supplies 03111 * Blowers: Industrial Types 03113 * Chillers, Heat Exchangers and Receivers 03115 * Chilled Water Meter System 03117 * Coils: Chilled or Heated Water, and Direct Expansion 03118 * Coil and Fan Units, Air Conditioning 03120 * Compressors, Air Conditioning: Hermetically Sealed, Window Unit Type 03121 * Compressors, Air Conditioning: Industrial Type, and Parts 03123 * Condensing Units (For Air Conditioners) 03125 * Controls: Limit Switches, Relays, Thermostats, Gas Valves, etc. 03126 * Control Systems: Complete (For Automatic Temperature Control) 03128 * Cooling Towers: Forced Air, Gravity, etc. 03130 * Dehumidifiers and Humidifiers 03132 * Duct, Prefabricated (Flexible or Rigid): Glass Fiber, Plastic, etc. 03133 * Duct, Fabricated, Metal 03134 * Dust Collectors, Industrial Type 03136 * Electronic Air Cleaners, Electrostatic Precipitators, Accessories, and Parts 03138 * Evaporative Coolers 03140 * Fans, Industrial Types: Attic, Exhaust, Forced Draft, etc. 03141 * Fans, Room Type, Ceiling and Portable Type (Stationary and Oscillating) 03143 * Filter Coating, Adhesive, Coil Cleaners, Degreasing Solvents, etc. 03144 * Filters, Air Conditioning (Permanent Type) 03145 * Filters, Air Conditioning (Disposable Types) 03146 * Filters and Filter Media, Evaporative Cooler 03149 * Filter Frames, Metal 03150 * Freon 03151 * Furnaces, Central Heating Type (Forced Air, Gas Fired) 03153 * Grilles, Diffusers, Registers, etc. 03155 * Hand Tools, Air Conditioning and Heating Service Type (Includes Leak Detectors) 03156 * Heat Pumps 03157 * Heaters, Electric (Baseboard Type) and Parts 03158 * Heaters, Electric (Panel or Wall Type) and Parts 03159 * Heaters, Electric (Portable) and Parts 03160 * Heaters, Gas-Fired (Space Type, Vented and Unvented) and Parts 03161 * Heaters, Gas-Fired (Wall Type, Vented and Unvented) and Parts 03162 * Heaters, Kerosene or Oil Fired (Space Type, Vented and Unvented) and Parts 03163 * Heaters, Space, Steam 03165 * Heating Elements, Electric 03169 * Odor Control Equipment (Indoor) 03172 * Pumps, Descaling Acid 03173 * Pumps, Refrigerant Circulating 03174 * Pumps, Refrigerant Vacuum 03178 * Roof Ventilators, Power Driven 03179 * Roof Ventilators, Wind Driven 03182 * Stoves, Wood or Coal 03187 * Testing and Recording Instruments 03189 * Thermometers and Gauges 03191 * Unit Heaters, Electric (Duct and Suspended Types) 03192 * Unit Heaters, Gas-Fired (Duct and Suspended Types) 03193 * Unit Heaters, Gas-Fired (Radiant and Infrared, Portable and Stationary) 03194 * Unit Heaters, Steam and Hot Water Types 03195 * Ventilators, All Types (See Class 031-78, 79 for Roof Type) 03196 * Vent Pipes, Fittings, and Accessories