A scanner enables full productivity and individual image size detection, without user intervention for mixed size originals in both simplex and duplex scanning modes. One of the panels includes a rigid substrate, for example made of glass or rigid plastic. The auxiliary mirror is composed of a planar array of reflecting facets mimicking a convex mirror. The end component is on top of the protective cover allowing air to flow from the opening between the air guide and the end component to a detent, which turns the direction of the air flow.