PURPOSE: To prevent discharged air from contact to the lower surface of the front part of a counter table in a system kitchen and avoid the interference of an auxiliary air discharge port body with a user performing kitchen work while keeping as a whole the appearance satisfactorily.

CONSTITUTION: An auxiliary air discharge port body 19 provided in an air discharge port 15 is adapted to project outward from the air discharge port 15 at least in drying tableware to be dried during the running of a dryer and restricted in a non-projecting position except for in the drying the tableware. Then the projection of the auxiliary air discharge port body 19 may be effected by a spring 25 generating an elastic force on the basis of the operation of an electromagnet 27 or the deformation of a thermal actuation body or by a motor or the heat respondent body itself. Also non-projecting position may be restricted by a stopper 28 or the thermal actuation body.