00 Computer Hardware and Software Manufacturers

04 Masonry Manufacturers

05 Metals Manufacturers

06 Wood, Plastics, and Composites Manufacturers

07 Thermal and Moisture Protection

09 Finishes Manufacturers

10 Specialties Manufacturers

11 Equipment Manufacturers

21 Fire Suppression Manufacturers

22 Plumbing Manufacturers

23 Heating, Ventilating, and Air Conditioning (HVAC) Manufacturers

23 01 30.51 HVAC Air-Distribution System Cleaning

23 05 23 General-Duty Valves for HVAC Piping

23 05 53 Identification for HVAC Piping and Equipment

23 07 13 Duct Insulation

23 09 00 Instrumentation and Control for HVAC

23 09 33 Electric and Electronic Control System for HVAC

23 09 43 Pneumatic Control System for HVAC

23 20 00 HVAC Piping and Pumps

23 21 23 Hydronic Pumps

23 21 29 Condensate Pumps

23 30 00 HVAC Air Distribution

23 33 00 Air Duct Accessories

23 33 46 Flexible Ducts

23 34 00 HVAC Fans

23 34 23 HVAC Power Ventilators

23 34 33 Air Curtains

23 37 13 Diffusers, Registers, and Grilles

23 37 23 HVAC Gravity Ventilators

23 38 13 Commercial-Kitchen Hoods

23 40 00 HVAC Air Cleaning Devices

23 41 00 Particulate Air Filtration

23 50 00 Central Heating Equipment

23 51 00 Breechings, Chimneys, and Stacks

23 51 19 Fabricated Stacks

23 54 00 Furnaces

23 56 00 Solar Energy Heating Equipment

23 57 00 Heat Exchangers for HVAC

23 70 00 Central HVAC Equipment

23 81 00 Decentralized Unitary HVAC Equipment

23 81 16 Room Air-Conditioners

23 82 00 Convection Heating and Cooling Units

23 82 16 Air Coils

23 82 23 Unit Ventilators

23 83 00 Radiant Heating Units

23 83 23 Radiant-Heating Electric Panels

23 83 33 Electric Radiant Heaters

23 84 19 Desiccant Dehumidification Units

26 Electrical Manufacturers

28 Electronic Safety and Security Manufacturers

33 Utilities Manufacturers

42 Process Heating, Cooling, and Drying Equipment Manufacturers

43 Process Gas and Liquid Handling, Purification, and Storage Equipment Manufacturers

44 Pollution and Waste Control Equipment Manufacturers

23 05 53 Identification for HVAC Piping and Equipment Products

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