Minimum slope requirements shall be as followings: 1- for wet type sprinkler system, no slope required. 2- For dry and pre-action pipe systems in non-refrigerated areas, branch lines shall be pitched at least 1⁄2 in. per 10 ft (4 mm/m), and mains shall be pitched at least 1⁄4 in. per 10 ft (2 mm/m)
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