The invention relates to an agricultural machine (50), preferably a separating device (50) for the pressure difference-based separation of grains (S), with an air line (10) which has a jacket (1) and a flow cross section (2) for guiding an air flow ( L). The agricultural machine (50) is distinguished in particular by the fact that the air line (10) has at least one air guiding section (3) in order to direct the air flow (L), in particular radially inward, and / or the jacket (1) has a Has passage opening (KE) and the jacket (1) is shaped inwardly in order to form a recess (4) in the direction of the passage opening (KE).
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