23 00 00 Heating, Ventilating, and Air-Conditioning (HVAC)

23 20 00 HVAC Piping and Pumps

23 21 00Hydronic Piping and Pumps23 22 00Steam and Condensate Piping and Pumps23 23 00Refrigerant Piping23 24 00Internal-Combustion Engine Piping23 25 00HVAC Water Treatment

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