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Brian took a series of photos to illustrate the effect of fan air control on the spray pattern. In these three shots, the fan air control is opened 1/2 turn, a full turn, and 1 1/2 turns, with a dramatic difference at each step. The first photo shows a small fan size with a lot of fluid concentrated in the center of the pattern. In the final photo, the fan is already starting to split, with fluid heavier at the ends than in the center. The in-between photo shows a well-shaped fan with even fluid distribution.