CHANTILLY, Va. - The Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) has announced that the third edition of HVAC Duct Construction Standards – Metal and Flexible is now available. It is intended primarily for commercial and institutional duct construction. The standard contains tables and details for constructing ductwork for 1/2 inch to 10 inch wg positive and negative pressures. This edition is said to improve 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 constructions details, new casing construction details, and additional accessory items. The standard applies to construction using uncoated steel, galvanized and stainless steels, and a limited range of aluminum ducts. The standard has been adopted in the ICC International Mechanical Code and includes soft metrics.

Members may purchase the 390-page HVAC Duct Construction Standards – Metal & Flexible at the special member price of $35 for the book, $41 for the CD-ROM, $52 for the CD/book combination, and $35 for the PDF download.