Patent ID: 7981179

Claim:
An air cleaner comprising: a case; an intake port leading outside air into the case; an exhaust port provided on a side of the case opposite to the intake port; and a filter dividing the case into a suction side air chamber into which outside air flows from the intake port and an exhaust side air chamber discharging air from the exhaust port, wherein the filter extends from an upper end edge adjacent to the intake port to a lower end edge adjacent to the exhaust port; a distance between a wall part of the suction side air chamber and the filter gradually decreases toward a back of the suction side air chamber from the intake port; a distance between a wall part of the exhaust side air chamber and the filter gradually increases to the exhaust port; a first plurality of ribs extend from the wall part of the suction side air chamber in a direction crossing an inflow direction of outside air from the intake port; and the first plurality of ribs are arranged between the upper end edge and the lower end edge of the filter to assist in a smooth flow of air from the suction side air chamber toward the filter and to the exhaust side air chamber.