Fabricating a round-to-rectangular transition that is too abrupt, causing turbulence

Common mistake

Verify first

Verify before you commit. Cheap to catch now.

Fabricating a round-to-rectangular transition that is too abrupt, causing turbulence

The taper angle should not exceed 15-20 degrees from centerline on each side. If the transition must be short, flag it to the engineer - abrupt transitions kill airflow and create noise.

Rectangular Duct & Fittings 2nd Year YELLOW