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23 Heating, Ventilating, and Air Conditioning (HVAC)
23 20 00 HVAC Piping and Pumps
23 20 00 HVAC Piping and Pumps
- 23 21 00 Hydronic Piping and Pumps
- 23 22 00 Steam and Condensate Piping and Pumps
- 23 23 00 Refrigerant Piping
- 23 24 00 Internal-Combustion Engine Piping
- 23 25 00 HVAC Water Treatment