Producing flat oval duct that doesn't hold dimension after forming due to incorrect gauge selection

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Producing flat oval duct that doesn't hold dimension after forming due to incorrect gauge selection

Flat oval duct requires stiffer gauge than round duct of equivalent area due to the flat sides. If the duct is springing open or closing after forming, the gauge is too light. Check the SMACNA flat oval tables for the correct minimum gauge.

Round, Spiral & Oval Duct 2nd Year YELLOW