Patent ID: 8654528

Claim:
An electric connection box, comprising: a circuit board having a first surface capable of mounting an electronic component, and a second surface defining a non-mounting surface; a case housing the circuit board, the circuit board oriented in a substantially vertical direction; a vertical inner wall surface of the case formed opposite the second surface of said circuit board, the vertical inner wall surface and the second surface of said circuit board defining a substantially vertical air ventilation path; a first suction port and a second suction port positioned in said case and in communication with said ventilation path, wherein the first suction port is positioned in a bottom portion of the case and the second suction port is positioned in a lower side portion of the case and the first suction port and the second suction port are configured such that air that passes through the first suction port and air that separately passes through the second suction port converges before or in the ventilation path; a first exhaust port and a second exhaust port positioned in said case above said positions of the first suction port and the second suction port in an upper side portion of the case and in communication with said ventilation path, the first exhaust port laterally penetrating the vertical inner wall surface of the case, the second exhaust port laterally penetrating the case opposite the first exhaust port with respect to the ventilation path, and each of the first exhaust port and the second exhaust port having an opening area larger than an opening area of each of the first suction port and the second suction port; a bulged section provided on the case, the first suction port is positioned on a bottom surface of the bulged section and the second suction port is positioned on a side surface of the bulged section; and a heat generating component positioned in the bulged section and in communication with said ventilation path; wherein air flow through the air ventilation path is created by natural convection.