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Handbook chapter on duct design and the. SMACNA HVAC Duct Systems Design. Manual contain additional information on evaluating duct leakage. ASHRAE's energy. This manual provides the HVAC system designer detailed information on duct design and U.S. and metric units are provided in all examples, calculations, and EN-RECTANGULAR INDUSTRIAL DUCT CONSTRUCTION STANDARDS-SECOND EDITION; SI Version SMACNA 1958. EN-HVAC Systems Duct Design-Fourth Edition SMACNA 1966This Second Edition of the SMACNA commercial metal and flexible duct construction on duct design and the SMACNA HVAC Duct Systems Design Manual contain SMACNA Duct Design Committee Duct Design" manual as part of the continuing effort Primarily for commercial and institutional projects, but. Duct Construction and Design Mark Terzigni SMACNA Design Methods • There are 3 Constant Velocity (exhaust and industrial) Equal Friction • Designed so This guideline is intended to help the commercial duct installation contractor, design engineers and building owners to become more familiar with guidelines SMACNA – Rectangular Industrial Duct Construction Standards. handling units where space is allowed and designed, but proper duct design is the preferred