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.

The technical standards and manuals developed by SMACNA contractors are globally recognized and accepted within the construction community. Accredited by the American National Standards Institute (ANSI), SMACNA is a trusted authority in establishing and setting the industry standards.

The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) is an international trade association representing 3,500 signatory contracting firms with more than 100 chapters throughout the United States, Canada, Australia, and Brazil.

SMACNA Technical Papers and Guidelines review processes, specifications and requirements in various documents and standards, providing reviews, recommendations, clarifications and some useful tips for contractors.

SMACNA's Technical Resources Department fields several thousand technical questions annually from architects, engineers, manufacturers and government personnel. More than 17,000 orders for SMACNA technical manuals are processed and …

SMACNA represents a broad spectrum of contractors who use sheet metal to fabricate and build architectural, ductwork, and HVAC metal systems in industrial, commercial, architectural, and residential markets. Learn More

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.

This app allows you to easily and accurately size downspout and gutters using the methods and formulas covered in SMACNA’s Architectural Sheet Metal Manual (ASMM). The Rainfall Wizard allows you to select the closet city to use the information from the ASMM tables.

The Architectural Sheet Metal Manual by SMACNA provides comprehensive guidelines and standards for sheet metal and HVAC industry, including duct construction, roofing, welding, and more.

This app provides suggested leakage classes using the method outlined in SMACNA's HVAC Air Duct Leakage Manual. The method used is compliant with ASHRAE 90.1, IECC, IGCC Version 2, IMC and the UMC. Users can combine multiple sections of ductwork that vary by size and shape to calculate a total allowable leakage.