21 01 00 Operation and Maintenance of Fire Suppression 21 00 00 Fire Suppression 10 44 00 Fire Protection Specialties 01 45 23 Testing and Inspecting Services Estimating 21 20 00 Fire-Extinguishing Systems 21 13 00 Fire-Suppression Sprinkler Systems 21 10 00 Water-Based Fire Suppression Systems 21 09 00 Instrumentation and Control for Fire Suppression 21 05 00 Common Work Results for Fire Suppression