Technical Resources

Technical Standards

Technical Standards

Technical standards and manuals developed by SMACNA members have worldwide acceptance by the construction and code community, as well as local and national government agencies. ANSI, the American National Standards Institute, has accredited SMACNA as a standards-setting organization. SMACNA standards and manuals address all facets of the sheet metal and HVAC industry – including duct construction and installation, indoor air quality, energy recovery, roofing and architectural sheet metal, welding, and commissioning.


Rectangular Industrial Duct Construction Standards, 3rd Edition: 45 Day Public Review

The 45-Day Public Review draft of the SMACNA Rectangular Industrial Duct Construction Standards, I-P Version, 3rd Edition, is available. This 3rd Edition includes many of the same assumptions as the first and second edition, with a number of features indicated below:

  • Carbon and coated steel, stainless steel and aluminum include expanded panel pressure capacity tables and panel pressure capacity tables for reinforcements to accommodate larger ducts with panel widths to 16.0 feet wide.
  • To allow for added duct construction options, 2.5 ft stiffener spacing added to carbon and coated steel, stainless steel, and aluminum panel pressure capacity tables and panel pressure capacity tables for reinforcements.
  • Stainless steel panel pressure capacity tables added for Class 2, 3 and 4 applications
  • In addition to design capabilities for stainless steel operating at 120 °F, 350 °F and 800 °F, this third edition adds 500 °F.

Single copy price: N/A

Comment Deadline: June 2, 2022

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Technical Inquiries

In accordance with SMACNA Policy, a formal interpretation of the literal text of SMACNA's technical manuals, guides or standards is available but only on the basis of written request or inquiry. The request must pertain to a specifically identified portion of a SMACNA technical document that does not involve published text which already provides the requested information. In considering such requests, SMACNA will not review or judge products or components as being in compliance with the document or publication.

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Papers & Guidelines

SMACNA Technical Papers and Guidelines review processes, specifications and requirements in various documents and standards, providing reviews, recommendations, clarifications and useful tips for contractors. All papers and guidelines are copyrighted by SMACNA and SMACNA grants members single user permission to download and use. Any other use or distribution require SMACNA’s permission. 

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Technical Apps

SMACNA Technical Services provides the following apps: Air Duct Leakage App, Downspout and Gutter Sizing Calculator, HVAC Duct Construction, Round Industrial Duct Construction, Rectangular Industrial Duct Construction.

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