21-04 00 00 Services

21-04 10 Conveying 21-04 20 Plumbing 21-04 30 Heating, Ventilation, and Air Conditioning (HVAC) 21-04 40 Fire Protection 21-04 50 Electrical 21-04 60 Communications 21-04 70 Electronic Safety and Security 21-04 80 Integrated Automation

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