What is the maximum allowable misalignment that is not considered a miter?

• A. 1 degree
• B. 5 degrees
• C. 3 degrees
• D. 10 degrees

Answer: (C)

In ductwork joints, small angular differences between sections are tolerated to avoid needing a bevel-cut miter every time. A miter joint is formed by cutting ends at angles to meet at a corner, but if the misalignment is within a small limit, the joint can remain a simple butt joint and still seal properly. This limit is up to three degrees. So, a misalignment of three degrees or less is not considered a miter; beyond that, the joint would typically be treated as a miter and require angled cuts or a different fitting to achieve proper alignment and sealing.