The offset angle between two fittings is the number of degrees measured in a clockwise direction, between the fitting nearest the viewer and the farthest end fitting. Tolerance on the offset angle are +/- 3 degrees for assemblies up to 24 inches long and +/- 5 degrees for assemblies 24 inches and longer.
The following illustration shows the clockwise angle separation between a “close” fitting and a “far” fitting. The “close” fitting would be defined as the fitting closest when looking at an assembly end to end. The “far” fitting would be defined as the fitting on the far of the assembly when looking at an assembly end to end. The far end is used as the reference point and the “close” end establishes the angular difference.