A method of clearing a grain cleaning system (100) of an agricultural combine is provided. The method includes the step of providing and directing a flow of high velocity air in a first direction about an inlet end (118) of a cleaning shoe (108). The method further includes the step of monitoring the cleaning shoe (108) in order to detect a change in an operational parameter of the cleaning shoe, wherein the operational parameter is one of a transient effect of a sieve of the cleaning shoe (108), a flow rate about and exit end of the cleaning shoe (108) and a flow velocity about an exit end of the cleaning shoe (108). Further, the method includes the step of redirecting the flow of high velocity air in a second direction in response to a detected change in the operational parameter by moving at least a portion (132) of the housing (114).
