An assembly that facilitates the use of modules requiring orthogonal airflow in a chassis providing normal airflow. Partitions within the housing direct ambient airflow from the front air inlet, through the modules, and out the rear air exhaust. The housing and partitions define first and second vertically and horizontally offset slots for receiving first and second orthogonal airflow modules, and also define separate first and second airflow pathways. The first airflow pathway provides airflow through a front air inlet, under the second module, orthogonally through the first module and out the rear air exhaust. Similarly, the second airflow pathway provides airflow through a front air inlet, over the first module, orthogonally through the second module and out the rear air exhaust. Both airflow pathways both draw ambient air into the housing and exhaust warm air from the rear of the housing, while keeping the two airflow pathways separated.