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2703.10.4.4 Exhaust duct sprinkler system requirements.
Sprinkler systems installed in exhaust duct systems shall be hydraulically designed to provide 1/2 gallon per minute (gpm) (1.9 L/min) over an area derived by multiplying the distance between the sprinklers in a horizontal duct by the width of the duct. Minimum discharge shall be 20 gpm (76 L/min) per sprinkler from the five hydraulically most remote sprinklers.
2703.10.4.4.1 Sprinkler head locations.
Sprinkler heads shall be installed at 12-foot (3658 mm) intervals in horizontal ducts and at changes in direction. In vertical runs, sprinkler heads shall be installed at the top and at alternate floor levels.
2703.10.4.4.2 Control valve.
A separate indicating control valve shall be provided for sprinkler heads installed in exhaust ducts.
2703.10.4.4.3 Drainage.
Drainage shall be provided to remove sprinkler water discharged in exhaust ducts.
2703.10.4.4.4 Corrosive atmospheres.
Where corrosive atmospheres exist, exhaust duct sprinkler heads and pipe fittings shall be manufactured of corrosion-resistant materials or coated with approved materials.
2703.10.4.4.5 Maintenance and inspection.
Sprinkler heads in exhaust ducts shall be accessible for inspection and maintenance and shall be inspected and maintained on not less than an annual basis.

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