Can duct be notched or squeezed around a storm drain pipe?

Do not notch, flatten, or compress the duct around a plumbing line. Treat it as a coordination clash and bring measured offset options for approval.

['A cast-iron storm drain or roof drain line is a hard obstruction. Duct should not be smashed around it, and another trade's pipe should not end up touching the duct.', 'Measure the obstruction, clearance, and available space. The likely recovery is an approved 45° offset, revised route, split/transition detail, or coordination correction. Keep clearance for vibration, insulation, condensation, and service access.']

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