In a printer for printing a recording material, a printer frame bears a printing unit with a plurality of print heads arranged substantially horizontal and transverse to a transport direction of the recording material. A distributor is provided for air and a coupling unit is arranged stationary in the printer frame and via which air is supplied to the distributor. The distributor comprises at least one cooling air segment to supply cooling air in a vertical direction to the print heads and at least one exhaust air segment to discharge heated air.