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510.10 Supports.
Ducts shall be supported at intervals not exceeding 10 feet (3048 mm). Supports shall be constructed of noncombustible material.
Section MC 511: Dust, Stock and Refuse Conveying Systems
511.1 Dust, stock and refuse conveying systems.
Dust, stock and refuse conveying systems shall comply with the provisions of Section 510 and Sections 511.1.1 through 511.2.

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