Filter arrangement, which has - a filter frame for receiving a flat filter, - the flat filter, which has an air inlet side and an air outlet side, - an air intake region, which adjoins the air inlet side of the flat filter and is fluidically connected to an air inlet opening via an air intake channel, - an air outlet region, which adjoins the air outlet side of the flat filter and is fluidically connected to an air outlet opening via an air intake channel, wherein - air can flow through the flat filter from the air intake region to the air outlet region, - the flat filter is designed to be circular or elliptical, - a plane is defined by the flat filter, - an axial direction runs perpendicularly to the plane of the flat filter, - the axial extension of the flat filter overlaps by at least 60% in the axial direction with the axial extension of at least one of the air inlet opening and the air outlet opening, - the filter frame has an extension of less than a third of a diameter of the flat filter in the axial direction, and - the air inlet opening and the air outlet opening are arranged laterally on the filter frame, such that air is supplied and emitted from one side of the filter arrangement, such that an airflow flowing into the air inlet opening has a dominant flow component in a perpendicular direction to the axial direction, and such that an airflow flowing out of the air outlet opening has a dominant flow component in a perpendicular direction to the axial direction. - a filter frame for receiving a flat filter, - the flat filter, which has an air inlet side and an air outlet side, - an air intake region, which adjoins the air inlet side of the flat filter and is fluidically connected to an air inlet opening via an air intake channel, - an air outlet region, which adjoins the air outlet side of the flat filter and is fluidically connected to an air outlet opening via an air intake channel, wherein - air can flow through the flat filter from the air intake region to the air outlet region, - the flat filter is designed to be circular or elliptical, - a plane is defined by the flat filter, - an axial direction runs perpendicularly to the plane of the flat filter, - the axial extension of the flat filter overlaps by at least 60% in the axial direction with the axial extension of at least one of the air inlet opening and the air outlet opening, - the filter frame has an extension of less than a third of a diameter of the flat filter in the axial direction, and - the air inlet opening and the air outlet opening are arranged laterally on the filter frame, such that air is supplied and emitted from one side of the filter arrangement, such that an airflow flowing into the air inlet opening has a dominant flow component in a perpendicular direction to the axial direction, and such that an airflow flowing out of the air outlet opening has a dominant flow component in a perpendicular direction to the axial direction. - air can flow through the flat filter from the air intake region to the air outlet region, - the flat filter is designed to be circular or elliptical, - a plane is defined by the flat filter, - an axial direction runs perpendicularly to the plane of the flat filter, - the axial extension of the flat filter overlaps by at least 60% in the axial direction with the axial extension of at least one of the air inlet opening and the air outlet opening, - the filter frame has an extension of less than a third of a diameter of the flat filter in the axial direction, and - the air inlet opening and the air outlet opening are arranged laterally on the filter frame, such that air is supplied and emitted from one side of the filter arrangement, such that an airflow flowing into the air inlet opening has a dominant flow component in a perpendicular direction to the axial direction, and such that an airflow flowing out of the air outlet opening has a dominant flow component in a perpendicular direction to the axial direction.