IBC SL Series Installation & Operating Manual page 30

Section: Installation
termination using 4-inch pipe.
For 6 x 90º elbows, the maximum lineal (straight) length of pipe allowed is 152 feet
(200' – (6 x 8' = 48) = 152').
For 4-inch flexible PP pipe, up to 160 linear feet is allowed in vertical orientation (> 45
°). The equivalent length of 4-inch flexible PP pipe should be calculated using a multiple
of 1.2 (e.g., 45 'x 1.2 = 54').
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