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Installers shall provide the manufacturer's field fabrication and installation instructions.
Factory-made air ducts that are in accordance with UL 181 shall be supported in accordance with the manufacturer's installation instructions. Other ducts shall comply with SMACNA HVAC Duct Construction Standards — Metal and Flexible.

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603.8 Duct Systems, Support of Ducts
181 shall be supported in accordance with the manufacturer's installation instructions. Other ducts shall comply with SMACNA HVAC Duct Construction ...
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M1601.4.4 Duct Systems, Support
Factory-made ducts listed in accordance with UL 181 shall be supported in accordance with the manufacturer's installation instructions. Field ...
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Duct supports shall be designed to carry the weight of the duct half filled with material. Where sprinkler protection is provided or cleaning of duct ...
M1601.4.3 Duct Systems, Support
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