031-00 AIR CONDITIONING, HEATING, AND VENTILATING EQUIPMENT, PARTS AND ACCESSORIES (SEE CLASS 740 ALSO)
031-03 Air Conditioners: Commercial, and Parts and Accessories not Individually Itemized
031-04 Air Conditioners: Controlled Environment (For Computer Rooms, etc.), and Parts and Accessories not Individually Itemized)
031-05 Air Conditioners (Cooling and Cooling/Heating Types): Window and Wall Mounted, and Parts and Accessories Not Individually Itemiz ed
031-06 Air Conditioning and Heating: Central Units, and Parts and Accessories Not Individually Itemized
031-07 Air Circulation Equipment (Not Otherwise Classified)
031-08 Air Curtains
031-09 Air Flow Meters
031-10 Air Purifiers, Accessories and Supplies
031-11 Blowers: Industrial Types
031-13 Chillers, Heat Exchangers and Receivers
031-14 Chilled Water System, Portable
031-15 Chilled Water Meter System
031-16 Coatings and Sealants, Duct
031-17 Coils: Chilled or Heated Water, and Direct Expansion
031-18 Coil and Fan Units, Air Conditioning
031-20 Compressors, Air Conditioning: Hermetically Sealed, Window Unit Type
031-21 Compressors, Air Conditioning: Industrial Type, and Parts
031-23 Condensing Units (For Air Conditioners)
031-24 Controls, Cooling Tower Water Treatment: pH, Conductivity, Corrosion Sensors
031-25 Controls: Limit Switches, Relays, Thermostats, Gas Valves, etc.
031-26 Control Systems: Complete (For Automatic Temperature Control)
031-27 Cooling Tower Water Treatment: Non-chemical Ozone, Centrifugal Separators, Magnetic Descaling Equip. (See Class 885 for Chemical Types)
031-28 Cooling Towers: Forced Air, Gravity, etc.
031-29 Dampers, Motorized
031-30 Dehumidifiers and Humidifiers
031-31 Duct Cleaning Equipment, Air
031-32 Duct, Prefabricated (Flexible or Rigid): Glass Fiber, Plastic, etc.
031-33 Duct, Fabricated, Metal
031-34 Dust Collectors, Industrial Type
031-36 Electronic Air Cleaners, Electrostatic Precipitators, Ozonators, Accessories, and Parts
031-38 Evaporative Coolers
031-40 Fans, Industrial Types: Attic, Exhaust, Forced Draft, etc. (Including Fan Blades and Fan Parts)
031-41 Fans, Room Type, Ceiling and Portable Type (Stationary and Oscillating)
031-43 Filter Coating, Adhesive, Coil Cleaners, Degreasing Solvents, etc.
031-44 Filters, Air Conditioning/Furnace (Permanent Type)
031-45 Filters, Air Conditioning/Furnace (Disposable Types)
031-46 Filters and Filter Media, Evaporative Cooler
031-49 Filter Frames, Metal
031-50 Freon
031-51 Furnaces, Central Heating Type (Forced Air, Gas Fired)
031-53 Grilles, Diffusers, Registers, etc.
031-55 Hand Tools, Air Conditioning and Heating Service Type (Including Leak Detectors)
031-56 Heat Pumps
031-57 Heaters, Electric (Baseboard Type) and Parts
031-58 Heaters, Electric (Panel or Wall Type) and Parts
031-59 Heaters, Electric (Portable) and Parts
031-60 Heaters, Gas-Fired (Space Type, Vented and Unvented) and Parts
031-61 Heaters, Gas-Fired (Wall Type, Vented and Unvented) and Parts
031-62 Heaters, Kerosene or Oil Fired (Space Type, Vented and Unvented) and Parts
031-63 Heaters, Space, Steam
031-65 Heating Elements, Electric
031-66 Hydronic Specialties
031-69 Odor Control Equipment (Indoor)
031-70 Odor Control Equipment, Duct Air (Including Ozone Type)
031-72 Pumps, Descaling Acid
031-73 Pumps, Refrigerant Circulating
031-74 Pumps, Refrigerant Vacuum
031-75 Radiators, Heating
031-76 Recycled HVAC Products, Accessories, and Supplies
031-78 Roof Ventilators, Power Driven (Including Recycled Types)
031-79 Roof Ventilators, Wind Driven (Including Recycled Types)
031-80 Solar Heating Units
031-82 Stoves, Wood or Coal
031-87 Testing and Recording Instruments
031-89 Thermometers and Gauges
031-91 Unit Heaters, Electric (Duct and Suspended Types)
031-92 Unit Heaters, Gas-Fired (Duct and Suspended Types)
031-93 Unit Heaters, Gas-Fired (Radiant and Infrared, Portable and Stationary)
031-94 Unit Heaters, Steam and Hot Water Types
031-95 Ventilation Equipment and Systems (See 031-78 79 for Roof Ventilators)
031-96 Vent Pipes, Fittings, and Accessories
031-97 Vacuum System, Central, Including Filters, Parts and Accessories