Patent ID: 8899309

Claim:
A ventilation device comprising: a case including a pair of main plates disposed opposite each other and a pair of side plates disposed opposite each other and connecting end portions of the pair of main plates; and a first element and a second element in the form of a rectangular parallelepiped that are arranged adjacent to each other in a facing direction of the side plates, in which the pair of side plates face each other, and induce transfer of sensible heat and latent heat between outdoor air and indoor air, wherein the first element and the second element are of a crossflow type provided with transverse flow passages constituted by a plurality of channels formed by fins disposed between barrier plates and extending in the facing direction of the side plates, and longitudinal flow passages constituted by a plurality of through channels formed by fins disposed between barrier plates and extending in a facing direction of the main plates, in which the main plates face each other, the first element and the second element are disposed in postures such that the length directions thereof are parallel to each other, the first element is disposed such that a pair of opposing surfaces which include respective openings for the channels of the longitudinal flow passage is parallel to the one main plate, and the second element is disposed such that a pair of opposing surfaces which include respective openings for the channels of the longitudinal flow passage is parallel to the one main plate, a mixing flow passage formed as a result of the first element and the second element being disposed with a gap therebetween in the facing direction of the side plates is provided between the transverse flow passage of the first element and the transverse flow passage of the second element, a discharge air suction port and a discharge air blowing port are provided in the case, a discharge air path from the discharge air suction port to the discharge air blowing port has a circular route such that air sucked into the case in a first direction from the discharge air suction port flows to the side plate side with respect to the first element through a bypass circuit, passes through the longitudinal flow passage of the second element, and then flows in a second direction opposite to the first direction before passing through the longitudinal flow passage of the first element, an outside air suction port and an indoor air supply port are provided in the case, an air supply path from the outside air suction port to the indoor air supply port has a route such that air passes through the transverse flow passage of the first element and through the transverse flow passage of the second element, and air flowing in the air supply path is sandwiched between an air layer of the discharge air path above the air supply path and an air layer of the discharge air path below the air supply path.