22.15.00 General Service Compressed-Air Systems
22.15.19.19 General Service Packaged Rotary-Screw Air Compressors
22.15.13 General Service Compressed-Air Piping 22.15.16 General Service Compressed-Air Valves 22.15.19 General Service Packaged Air Compressors and Receivers 22.15.19.13 General Service Packaged Reciprocating Air Compressors 22.15.19.16 General Service Packaged Liquid-Ring Air Compressors 22.15.19.19 General Service Packaged Rotary-Screw Air Compressors 22.15.19.23 General Service Packaged Sliding-Vane Air Compressors