What standard should supports and hangers for ductwork be based on?

Supports and hangers for ductwork should be based on the SMACNA HVAC Duct Construction Standards. SMACNA, which stands for the Sheet Metal and Air Conditioning Contractors' National Association, provides comprehensive guidelines that cover the proper installation, support, and construction of duct systems. These standards are widely recognized in the HVAC industry and ensure that ductwork is not only structurally sound but also optimized for air performance and efficiency.

Using SMACNA standards helps ensure that the installation meets the required safety and performance criteria, which ultimately contributes to the reliability and longevity of the duct system. This is particularly important in both residential and light commercial applications where maintaining air quality and system efficiency is essential. Other options, while they may provide useful information regarding duct design or construction, do not focus specifically on the requirements for supports and hangers in the same way that SMACNA does.