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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
28. Ribbed forms of round duct are not yet standardized, but may be considered under equivalent-performance-alternative provisions. 29. Based on an ASHRAE test program Type 1 reinforcement of oval duct now has an internal tie rod. 30. Maximum support spacing for round flexible duct and connector was changed from 10’ to 5’ (1.5 meters). 31.
http://ehgduct.com/wp-content/uploads/2015/11/2013-01-Ductwork-Support-Spacing.pdf
Ductwork Support Spacing Tech Brief 13-01 Question…..can we use 14 foot support spacing for round spiral ductwork? Overview: SMACNA HVAC Duct Construction Metal and Flexible (2005) Table 5-2 allows for a maximum spacing of 12 feet. In addition SMACNA (2005) stipulates the required wire size, rod, or strap required for proper support.
https://basc.pnnl.gov/resource-guides/support-intervals-flex-ducts
The flex duct must be adequately supported to ensure the duct is not crimped and to maintain both air flow through the duct and the integrity of the duct coil and insulation material. When the flex duct is improperly supported, for example by spacing the support straps or saddles too far, the ducts can sag, restricting air flow.
https://www.tandfonline.com/doi/pdf/10.1080/00022470.1977.10470542
Round duct is usually used in the industrial ventilation, air pollution control, and dust collecting system. The round duct ... at maximum support spacing of 23 ft. Using Table 3, we realize that there is no tabulated gage for the exact data of the given example. The two data conditions
https://www.spotusa.com/products/spiral-round-duct/
Spiral Round Duct. Spiral round lock-seam duct is the most efficient way to transport air in HVAC systems. The round profile greater flow efficiencies than rectangular ducts. Because round ducts are inherently stronger than rectangular profiles, they can be lighter metal gauges and can be …
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