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https://nccashrae.org/images/meeting/031616/march_dinner_preso.pdf
ANSI/SMACNA 006-2006 HVAC Duct Construction Standards Eli P. Howard, III ... and routing of the duct system. 2. The types of fittings to be used based on ... Round, Oval and Flexible Duct. Chapter 5 Hangers and Supports. Chapter 8 Double-Wall Duct Construction. Chapter 10 Specialty
https://www.engineeringtoolbox.com/ductwork-spacing-d_927.html
Support systems for ductwork may provide restraint in three directions against displacement and rotation. Consideration must be given with restraining ducts to avoid development of excessive internal duct stresses caused by expansion or contraction due to temperature variations.
https://law.resource.org/pub/us/cfr/ibr/005/smacna.duct.1995.html
Maximum support spacing for round flexible duct and connector was changed from 10’ to 5’ (1.5 meters). 31. Additional riser support diagrams are provided. 32. Hold-down anchor spacings are given for round duct to be encased in concrete. ... the basis of compliance with the SMACNA HVAC Duct Construction Standards is as follows: 2” (500 Pa) ...
https://www.smacna.org/docs/default-source/technical-resources/smacnacadstandard.pdf?sfvrsn=d921fda5_4
SMACNA CAD Standard Second Edition v NOTICE TO USERS OF THIS PUBLICATION 1. DISCLAIMER OF WARRANTIES a) The Sheet Metal and Air Conditioning Contractor’s National Association (“SMACNA”) provides its product for informational
https://www.phpsd.com/rooftop-support-systems/duct-supports
PHP-D Duct Support. The PHP-D duct support leverages a goal-post design with a single crossbar below the duct to support all sizes of square or round ducting, cable trays, and piping. This support can meet nearly all height requirements above the roof surface and is approved for seismic and high-wind applications.
https://www.grbx.com/ipin/scans/2012/0900-A/Specs/233113.pdf
Construction Standards - Metal and Flexible," Figure 3-1, "Round Duct Transverse Joints," for static-pressure class, applicable sealing requirements, materials involved, duct-support intervals, and other provisions in SMACNA's "HVAC Duct Construction Standards - Metal and Flexible." 1.
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