Apprentice question
Verify first
Verify before you commit. Cheap to catch now.
Flat-oval needs support that respects its shape. A flat bar can distort the flat span if the duct is wide/heavy.
['Flat-oval duct has broad flat faces. If the support does not cradle it correctly, the bottom panel can sag and the internal air shape changes.', 'Check the duct profile, weight, support spacing, and approved support detail. Recovery may be shaped saddles, wider bearing, isolation pads, internal support, or a revised hanger layout.']