Fire Protection Contractor (C-20) General Engineering & Specialty Contractors (AC) General Engineering, General Building & Specialty Contractors (ABC) Plumbing Contractor (C-37) Refrigeration Contractor (C-40) Sheetmetal Contractor (C-44) Ventilating & Air Conditioning Contractor (C-52) Subcontractors Boiler, Hot-Water Heating & Steam Fitting Contractors (C-4)
General Engineering, General Contracting, Plumbing, Air Conditioning, Ventilation, Fire Protection, Boiler, Trash Chutes, Refrigeration, Medical Gases, Pneumatic Tube Systems and Process Piping