1. HEATING; VENTILATING; AIR CONDITIONING - ARCHITECTURAL SERVI 2. AIR CONDITIONING, HEATING AND VENTILATING ENGINEERING 3. BUILDING CONSTRUCTION, INDUSTRIAL (WAREHOUSE, ETC.) 4. BUILDING CONSTRUCTION, NON-RESIDENTIAL (OFFICE BLDG., ETC.) 5. BUILDING CONSTRUCTION, COMMERCIAL AND INSTITUTIONAL 6. HEATING, AIR CONDITIONING, AND VENTILATION MAINTENANCE AND R 7. HEATING, VENTILATING AND AIR CONDITIONING (HVAC)

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