TinnerFlow™2nd YearHangers, Supports & AnchorsCheck first
A bowed trapeze means the support span is not stiff enough for the load. Upgrade the support or add approved intermediate support before it distorts the duct.
Wide duct on light strut can turn the trapeze into a sagging cradle. When the strut bows, the duct corners and bottom skin can distort.
Check span, duct size/weight, rod locations, and clearance. The usual recovery is heavier/deeper strut, back-to-back channel, shorter spans, a center rod, or a separate engineered support.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.