Apprentice question
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Tight back-to-back offsets can make high-velocity air separate from the throat. Open it up, lengthen it, add approved vane/detail, or revise the fitting path before blaming the unit.
['A short S-offset changes direction twice in a tight space. On high-velocity supply air, the air can shear, tumble, and leave the inside throat instead of tracking smoothly through the fitting.', 'Recovery depends on the system: more travel length, smoother fitting geometry, approved turning vane detail, or a revised route. Get the foreman/detailer/TAB direction before adding internal vanes or changing the fitting design.']