Ventilation device

Ventilation device of substantially right parallelepipedic shape, with two parallel sidewalls (1a, 1b), and two parallel end walls (2a, 2b) connecting the side walls (1a, 1b), comprising an incoming air duct (9) which connects an incoming air inlet (10) to an incoming air outlet (11), and an exhaust air duct (12), which connects an exhaust air inlet (13) to an exhaust air outlet (14), a segment of the incoming air duct (9) and a segment of the exhaust air duct (12) forming a double duct laterally bounded by the side walls (1a, 1b) and serving as a heat exchanger with opposite flows in a heat-conducting connection, the double duct comprising a plurality of successive straight sections (6a, 6b, 6c, 6d, 6e), with directly successive straight sections (6a, 6b, 6c, 6d, 6e) each being connected by deflections (7a, 7b, 7c, 7d) having a deflection angle of 180° and separated in each case by one of a plurality of intermediate walls (5a, 5b, 5c, 5d) which are normal to the side wall (1a, 1b) and the end walls (2a, 2b) and each of which is adjacent laterally to both side walls (1a, 1b) and at the end to one of the end walls (2a, 2b), while a passage is left at the other end wall (2b, 2a) for the production of a deflection (7a, 7b, 7c, 7d) the corresponding segments of the incoming air duct (9) or of the exhaust air duct (12) of directly successive straight sections (6a, 6b, 6c, 6d, 6e) of the double duct being each adjacent and separated by one of the intermediate walls (5a, 5b, 5c, 5d) separating the straight sections (6a, 6b, 6c, 6d, 6e) of the double duct incoming air duct (9) being separated from the exhaust air duct (12) in each case by a partition (8) which is continuous in the longitudinal direction and arranged in each case diagonally in the double duct.