ANSI recognition increases the potential that SMACNA’s standards are internationally adopted for industry and regulatory use. The approval will also encourage wider domestic use of SMACNA’s standard by state- and local-code governing bodies as well as the design and engineering community. The new ANSI status will also enhance SMACNA’s overall credibility as a standards developing organization, both domestically and internationally.

The 390-page “HVAC Duct Construction Standards – Metal & Flexible” manual is intended primarily for commercial and institutional duct construction. The standard contains tables and details for constructing ductwork for ½ inch to 10 inch wg positive and negative pressures. This edition improves upon the second edition with expanded pressure class tables, separate tables for TDC/TDF construction and expanded tables for round duct construction including 6 inch wg positive and negative pressure and sizes up to 96 inches. New in this edition is an engineering and design chapter to provide additional information to design professionals, double-wall construction details, new casing construction details and additional accessory items. The standard is applicable for construction using uncoated steel, galvanized and stainless steels and a limited range of aluminum ducts. This standard has been adopted in the ICC International Mechanical Code.

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