The AisleLok Modular Containment system provides an out-of-the-box aisle containment solution which can be self-installed in minutes. The AisleLok Modular Containment system can be used to create hot aisle or cold aisle containment in standard rack row environments. The AisleLok Modular Containment contains three core components rack top baffles that are either vertical for hot aisle containment or angled for cold aisle containment, bi-directional swing doors for attaching to the end of each aisle and an adjustable rack gap panel for blocking out gaps between racks where they may be a pillar or space left for additional racks. All components use a non-intrusive mounting system and can be installed in a matter of minutes straight out of the box.