Abstract: A novel airflow controller is hereby disclosed in a variety of embodiments illustratively including round-design and tower-design embodiments. In one illustrative embodiment, an airflow controller apparatus includes a blower chamber, at least one sprayer, and at least one diverter. The blower chamber is configured for providing an airstream. The at least one sprayer is positioned proximate to the blower chamber and defines a spray path leading from the sprayer along which the sprayer is configured to spray a fluid. The at least one diverter is movably positioned proximate to the blower chamber and movable across a range of positions between a first position and a second position. When the diverter is in the first position, at least a portion of the airstream is directed out of the blower chamber away from the spray path of the at least one sprayer, and when the diverter is in the second position, at least a portion of the airstream is directed out of the blower chamber toward the spray path of the sprayer.