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510.3.5 Nonlisted Ductwork

Los Angeles Mechanical Code > 5 Exhaust Systems > 510.0 Exhaust Duct Systems > 510.3 Openings > 510.3.5 Nonlisted Ductwork
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On nonlisted ductwork, the edge of the opening shall be not less than 11/2 inches (38 mm) from all outside edges of the duct or welded seams. [NFPA 96:7.4.1.5]

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510.3.5 Exhaust Systems, Nonlisted Ductwork
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