About This Book
The HVAC Duct Construction Standards – Metal and Flexible, 4th Edition (ANSI/SMACNA 006-2020), published by SMACNA, is the industry-standard reference for designing, fabricating, and installing commercial and residential air duct systems.
Core Scope
- Pressure Classes: Covers rectangular, round, flat oval, and flexible ductwork for positive and negative static pressure classes from -10 to +10 inches w.g.
- Materials and Sizing: Specifies galvanized, stainless, and uncoated steel, plus limited aluminum, for widths up to 120 inches and diameters up to 84 inches.
- Professional Use: An essential reference for mechanical engineers, sheet metal contractors, fabricators, and installers—and widely used in state contractor licensing exams, including Florida.
Key Updates in the 4th Edition (2020)
- Flat Oval Tables: New structural schedules for positive and negative pressure flat oval applications.
- Advanced Sealants: Added guidance on spray and aerosolized duct sealants.
- Alternative Liners: Expanded criteria for non-fiberglass duct liner applications.
- Supports and Fittings: Updated hanger spacing, support bracing requirements, and expanded spiral duct fitting data.
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Practice Tests Using This Book
This book is required or recommended for 3 licensing exams. We've written 41 practice questions directly from this material, each one citing the chapter and section it comes from.