Sheet Metal & Air Conditioning Contractors’ National Association

Papers and Guidelines

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These papers are copyrighted by SMACNA. SMACNA grants single user permission to download and use. Any further use in part or in whole requires permission.


 

Rooftop Ductwork – Round or Rectangular?


This technical resources bulletin discusses the differences between round and rectangular duct types, and factors to consider when choosing the appropriate duct type for rooftop ductwork applications.