42 01 00 Operation and Maint. of Process Heating/Cooling and Drying Eqpt. 23 60 00 Central Cooling Equipment 11 90 00 Other Equipment 42 20 00 Process Cooling Equipment 06 72 00 Composite Structural Assemblies 13 01 00 Operation and Maintenance of Spec. Construction 13 30 00 Special Structures