Fibrous Glass Duct Construction Standards 8th Edition – SMACNA

The Fibrous Glass Duct Construction Standards by SMACNA (Sheet Metal and Air Conditioning Contractors’ National Association) provide comprehensive guidelines for the fabrication and installation of fibrous glass duct systems used in HVAC applications. Here’s a detailed breakdown of what the standards cover:

 Key Technical Areas Covered

Material Specifications:

• Performance characteristics of fibrous glass boards.
• Application details for 1400 El 2” boards, including reinforcement and fastener guidelines.

Duct Fabrication:

• Construction of rectangular ducts and fittings.
• Details for closures of seams and joints, including adhesives and mechanical fasteners.

Reinforcement Systems:

• Updated standards for tie rod reinforcements, channel systems, and partial wrap-around reinforcements.
• Guidelines for using reinforcements with newer board types2.

Connections and Supports:

• Specifications for connections to equipment and air terminals.
• Hanger schedules and support systems for ducts under 2” w.g. (water gauge) pressure.

Fittings and Closures:

• Illustrated construction techniques for a full range of fittings.
• Provisions for closures and specifications referenced by NAIMA and UL

About SMACNA

The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) is a prominent international trade association established to support and advance the sheet metal and air conditioning industry. Founded in 1943, SMACNA represents over 3,500 signatory contracting firms across more than 100 chapters in the United States, Canada, Australia, and Brazil.

Other Works:

• Architectural Sheet Metal Manual – SMACNA
• HVAC Duct Construction Standards – Metal and Flexible, 4th Edition 
• Energy Systems Analysis and Management – SMACNA