When laying out a rectangle-to-round fitting, what section of the plan view should be drawn?

When laying out a rectangle-to-round fitting, drawing a half section of the plan view is essential for properly visualizing and constructing the fitting. This is because a half section provides the necessary detail to accurately depict the transition from the rectangular duct to the round duct, showcasing both the inside and outside shapes that will be created in the fitting.

Using a half section allows for a clear view of how the two different shapes will interact with each other during installation. It provides crucial information such as dimensions and angles that need to be accounted for in the fitting's design, ensuring that the airflow will transition smoothly from the rectangle to the round shape.

Other options, such as a quarter section or a full plan view, do not provide the same level of insight and detail required for this specific fitting. A quarter section may not show the necessary features fully or accurately, while a full plan view could clutter the layout with excess information that isn't needed for the fitting's construction.