22 00 00 Plumbing 22 01 00 Operation and Maintenance of Plumbing 22 33 00 Electric Domestic Water Heaters 22 34 00 Fuel-Fired Domestic Water Heaters 23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 23 01 00 Operation and Maintenance of HVAC Systems 23 54 00 Furnaces

22 33 00 Electric Domestic Water Heaters 22 34 00 Fuel-Fired Domestic Water Heaters 23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 23 30 00 HVAC Air Distribution 23 40 00 HVAC Air Cleaning Devices 23 41 00 Particulate Air Filtration 23 52 00 Heating Boilers 23 54 00 Furnaces 23 83 00 Radiant Heating Units 33 31 00 Sanitary Utility Sewerage Piping