22 15 00 General Service Compressed-Air Systems 22 61 00 Compressed-Air Systems for Laboratory and Healthcare Facilities 23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 43 15 00 Process Air and Gas Filters 44 10 00 Air Pollution Control 46 51 00 Air and Gas Diffusion Equipment 50 59 00 Construction Material Delivery/Hauling 50 61 00 Construction Material Supplier 50 63 00 Equipment/Tool Sales 50 64 00 HVAC Supplies

05 50 00 Metal Fabrications 05 59 00 Metal Specialties 08 13 00 Metal Doors 23 31 00 HVAC Ducts and Casings 23 33 00 Air Duct Accessories 45 39 00 Fabricated Metal Product Manufacturing Equipment 50 61 00 Construction Material Supplier 50 64 00 HVAC Supplies

05 10 00 Structural Metal Framing 05 51 00 Metal Stairs 05 52 00 Metal Railings 05 54 00 Metal Floor Plates 05 59 00 Metal Specialties 23 31 00 HVAC Ducts and Casings 50 59 00 Construction Material Delivery/Hauling 50 61 00 Construction Material Supplier 50 64 00 HVAC Supplies

07 21 00 Thermal Insulation 50 61 00 Construction Material Supplier 50 64 00 HVAC Supplies

23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 23 01 00 Operation and Maintenance of HVAC Systems 23 31 00 HVAC Ducts and Casings 23 33 00 Air Duct Accessories 50 59 00 Construction Material Delivery/Hauling 50 61 00 Construction Material Supplier 50 63 00 Equipment/Tool Sales 50 64 00 HVAC Supplies