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You have to look at the system, not just one duct run.
Is this the main, or just one branch to a grille?
Is this the longest run (critical path) or are there other longer runs?
Is the flat portion significantly less cross area than the round duct?
Airflow and duct sizes?
Static pressure of the fan?
Overall not a bad fitting, but if in the critical path I would be a little concerned.
If not in the critical path, I would not be too concerned. Unless area is significantly reduced.
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“The wave is not the water. The water merely told us about the wave moving by” – Buckminster Fuller
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