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

23 52 00 Heating Boilers 02 58 00 Snow Control 22 33 00 Electric Domestic Water Heaters 22 34 00 Fuel-Fired Domestic Water Heaters 23 83 00 Radiant Heating Units 40 18 00 Vacuum Systems Process Piping