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FC § 2703.10.4.4
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.
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