- 15160 - Storm Drainage Piping
- 15610 - Refrigeration Compressors
- 15620 - Packaged Water Chillers
- 15670 - Refrigerant Condensing Units
- 15760 - Terminal Heating and Cooling Units
- 15770 - Floor-Heating & Snow-Melting Equipment
- 15780 - Energy Recovery Equipment
- 15800 - Air Distribution
- 15810 - Ducts
- 15830 - Fans
- 15850 - Air Outlets and Inlets
- 22 14 00 - Facility Storm Drainage
- 22 14 13 - Facility Storm Drainage Piping
- 22 14 26 - Facility Storm Drains
- 23 30 00 - HVAC AIR DISTRIBUTION
- 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 37 00 - Air Outlets and Inlets
- 23 37 13 - Diffusers, Registers, and Grilles
- 23 37 23 - HVAC Gravity Ventilators
- 23 61 00 - Refrigerant Compressors
- 23 61 13 - Centrifugal Refrigerant Compressors
- 23 61 16 - Reciprocating Refrigerant Compressors
- 23 61 23 - Rotary-Screw Refrigerant Compressors
- 23 63 00 - Refrigerant Condensers
- 23 64 00 - Packaged Water Chillers
- 23 64 13 - Absorption Water Chillers
- 23 64 16 - Centrifugal Water Chillers
- 23 64 19 - Reciprocating Water Chillers
- 23 64 26 - Rotary-Screw Water Chillers
- 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 82 00 - Convection Heating and Cooling Units
- 23 82 16 - Air Coils
- 23 82 19 - Fan Coil Units
- 23 82 23 - Unit Ventilators
- 23 82 26 - Induction Units
- 23 82 33 - Convectors
- 23 82 36 - Finned-Tube Radiation Heaters
- 23 82 39 - Unit Heaters
- 23 83 00 - Radiant Heating Units
- 44 11 00 - Air Pollution Control Equipment