Apprentice question
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Flat-oval duct needs shape control across the flat spans. Hold the run and add approved reinforcement or replace with properly rated duct.
['Flat-oval spiral can deform across the flat top and bottom when pressure, gauge, support, or reinforcement is not right for the job. Once the shape changes, hanger rods, joints, and airflow all start fighting each other.', 'Check the pressure class, duct size, support spacing, and manufacturer/SMACNA reinforcement requirement. The recovery is usually internal tie-rods, external reinforcement ribs, corrected supports, or replacement with a properly rated section.']