Today's small and compact, multi-function electronic controls, variable speed drives, servos and programmable logic controllers (PLC) are extremely sensitive to heat and contamination. Smaller cabinet sizes make temperature control difficult and contribute to significant premature failures. Excessive heat causes components to cook, digital displays to misread, controls to drift, and breakers to trip below their rated loads. The result is often lost productivity from machine or line shutdown. And fans often provide inadequate cooling and commonly pull in dirty, humid air creating another source of failure.