chassis has been removed n fig7 a and 7 b a substantially complete chassis is shown in fig7 c fig7 a illustrates the airflow for an atca chassis configuration that includes a plurality of axial fans 700 located toward the outlet of a top plenum 702 see fig7 c this configuration is referred to as a u201c draw through u201d configuration as air is drawn through the various duct channels of airflow director 200 by creating a slight vacuum on the outlet side of the airflow director in one embodiment axial fans 700 are part of a modular fan assembly that includes multiple u201c hot swappable u201d fans meaning a failed fan may be replaced without removing power to the other fans in fig7 b and 7 c an additional set of axial fans 701 are located toward the lower front of an atca chassis 710 to push air into the inlet side of airflow director 200 this configuration is referred to as a u201c push through u201d configuration as air is pushed into the inlet side of airflow director 200 by axial fans 701 it is noted that a combination of a push through and draw through configuration exist when both axial fans 700 and 701 are installed in one embodiment axial fans 701 are part of a modular fan assembly that includes multiple hot swappable fans in addition to the axial fans depicted in the figures herein other types of fans may be used for example one or more centrifugal fans may employed in place of or in addition to axial type fans the atca chassis 710 includes top and bottom slot guides 704 and 706.