Abstract: An air duct arrangement for cooling a group (1) of at least two heat producing modules is provided, said modules (2, 3) being arranged one after the other in the direction of an air flow through said group (1), said air duct arrangement comprising an air path (5, 6) for each module (2, 3). The cooling of modules of a group of modules with cooling air should be enabled with only small space requirements. To this end said air paths (5, 6) are arranged in parallel along a lengthwise direction from a first side of said group (1) to a second side of said group (1), said second side being opposite to the first side, said air path (5, 6) changing their order in a direction perpendicular to said lengthwise direction in a region (13) between said two modules (2, 3).