Patent ID: 7028752

Claim:
Ventilation device 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 heat exchanger in which they are led in the form of a double duct with opposite flows in a heat-conducting connection, the double duct comprising a plurality of successive straight sections ( 6 a , 6 b , 6 c , 6 d , 6 e ), with directly successive straight sections ( 6 a , 6 b , 6 c , 6 d , 6 e ) each being connected by deflections ( 7 a , 7 b , 7 c , 7 d ) having a deflection angle of 180°, the double duct having an approximately rectangular cross-section in the straight sections ( 6 a , 6 b , 6 c , 6 d , 6 e ) and wherein in the straight sections ( 6 a , 6 b , 6 c , 6 d , 6 e ) of the double duct, the incoming air duct ( 9 ) is separated from the exhaust air duct ( 12 ) in each case by a partition ( 8 ) which is continuous in the longitudinal direction, the partitions ( 8 ) being arranged in each case diagonally in the double duct.