A seed treater having upper and lower ends includes a mixing bowl. The mixing bowl includes a stator having an annular upper inner surface defining an upper portion of the open interior of the mixing bowl, and a rotor defining a lower portion of the open interior of the mixing bowl. An air duct is fluidly connected to the mixing bowl and is configured to be fluidly connected to an air mover. The air duct includes a duct outlet configured to direct forced air from the air mover into the upper portion of the open interior defined by the upper stator to direct the seeds flowing in the upper portion of the interior of the mixing bowl inward toward a generally vertical axis of the mixing bowl as the lower rotor rotates relative to the upper stator.