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18-28-603.9  Supports.
   Ducts shall be supported with approved hangers at intervals not exceeding 10 feet (3048 mm) or as specified in the SMACNA HVAC Duct Construction Standards – Metal and Flexible or by other approved duct support systems designed in accordance with the building code. Flexible and other factory-made ducts shall be supported at least every 5 feet (1524 mm).