- 05 58 00 - Formed Metal Fabrications
- 05 58 13 - Column Covers
- 05 58 16 - Formed Metal Enclosures
- 05 58 19 - Heating/Cooling Unit Covers
- 05580 - Formed Metal Fabrications
- 15500 - Heat Generation
- 15700 - Heating, Ventilating, Air Conditioning Equipment
- 15720 - Air Handling Units
- 15750 - Humidity Control Equipment
- 15780 - Energy Recovery Equipment
- 15810 - Ducts
- 15830 - Fans
- 15850 - Air Outlets and Inlets
- 15860 - Air Cleaning Devices
- 23 31 00 - HVAC Ducts and Casings
- 23 31 13 - Metal Ducts
- 23 31 16 - Nonmetal Ducts
- 23 33 46 - Flexible Ducts
- 23 34 00 - HVAC Fans
- 23 34 13 - Axial HVAC Fans
- 23 34 16 - Centrifugal HVAC Fans
- 23 34 23 - HVAC Power Ventilators
- 23 34 33 - Air Curtains
- 23 35 13 - Sawdust Collection Systems
- 23 37 00 - Air Outlets and Inlets
- 23 37 13 - Diffusers, Registers, and Grilles
- 23 37 23 - HVAC Gravity Ventilators
- 23 40 00 - HVAC AIR CLEANING DEVICES
- 23 41 00 - Particulate Air Filtration
- 23 41 33 - High-Efficiency Particulate Filtration
- 23 41 43 - Ultra-Low Penetration Filtration
- 23 43 00 - Electronic Air Cleaners
- 23 50 00 - CENTRAL HEATING EQUIPMENT
- 23 60 00 - CENTRAL COOLING EQUIPMENT
- 23 70 00 - CENTRAL HVAC EQUIPMENT
- 23 71 00 - Thermal Storage
- 23 72 00 - Air-to-Air Energy Recovery Equipment
- 23 72 13 - Heat-Wheel Air-to-Air Energy-Recovery Equipment
- 23 72 16 - Heat-Pipe Air-to-Air Energy-Recovery Equipment
- 23 73 13 - Modular Indoor Central-Station Air-Handling Units
- 23 73 23 - Custom Indoor Central-Station Air-Handling Units
- 23 74 00 - Packaged Outdoor HVAC Equipment
- 23 75 00 - Custom-Packaged Outdoor HVAC Equipment
- 23 80 00 - DECENTRALIZED HVAC EQUIPMENT
- 23 84 00 - Humidity Control Equipment
- 23 84 13 - Humidifiers
- 23 84 16 - Dehumidifiers
- 23 84 19 - Indoor Pool and Ice-Rink Dehumidification Units
- 44 11 00 - Air Pollution Control Equipment
- 44 11 16 - Industrial Dust Collectors