A computer has an internal chassis with a variety of electronic components. The chassis is mounted within an enclosure having a ventilation port for exhaust air on a lower surface. A diffuser is mounted to the lower end of the enclosure. The diffuser has a series of openings and baffles which align with the ventilation port for directing the flow of exhaust air away from either side of the computer. The diffuser also allows for full containment of hot or flaming parts to satisfy safety codes. In addition, a pedestal is detachably coupled to the diffuser and is configured to enhance the air flow performance of the diffuser.