21 13 00 Fire-Suppression Sprinkler Systems
21 13 23 Combined Dry-Pipe and Preaction Sprinkler Systems
21 13 13 Wet-Pipe Sprinkler Systems 21 13 16 Dry-Pipe Sprinkler Systems 21 13 19 Preaction Sprinkler Systems 21 13 23 Combined Dry-Pipe and Preaction Sprinkler Systems 21 13 26 Deluge Fire-Suppression Sprinkler Systems 21 13 29 Water Spray Fixed Systems 21 13 36 Antifreeze Sprinkler Systems 21 13 39 Foam-Water Systems