23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 23 01 00 Operation and Maintenance of HVAC Systems 23 06 00 Schedules for HVAC 23 07 00 HVAC Insulation 23 08 00 Commissioning of HVAC 23 09 00 Instrumentation and Control for HVAC 23 20 00 HVAC Piping and Pumps 23 21 00 Hydronic Piping and Pumps 23 23 00 Refrigerant Piping 23 52 00 Heating Boilers 23 57 00 Heat Exchangers for HVAC 23 65 00 Cooling Towers

10 44 00 Fire Protection Specialties 21 00 00 Fire Suppression 21 01 00 Operation and Maintenance of Fire Suppression 21 09 00 Instrumentation and Control for Fire-Suppression Systems 21 11 00 Facility Fire-Suppression Water-Service Piping 21 13 00 Fire-Suppression Sprinkler Systems 23 23 00 Refrigerant Piping

01 00 00 General Requirements 11 20 00 Commercial Equipment 11 40 00 Foodservice Equipment 23 23 00 Refrigerant Piping 23 61 00 Refrigerant Compressors 23 63 00 Refrigerant Condensers