It is capable of maintaining an internal ambient temperature below 38 degrees Celsius when functioning with Intel's Pentium 4 and Celeron D processors based on 90 nm process technology, and an ambient temperature below 39 degrees Celsius when using a Pentium D processor.
In the 1.1 version, the TAC design is intended to disallow internal temperature rises of more than 3 degrees Celsius, and provide the processor with a cooler environment to work in.
This causes a slight depressurization inside the chassis, and requires all other openings to become intake vents.
The rear chassis exhaust fan is required to be at least 92-mm or larger, providing a minimum of 55 CFM in free air.
The processor is required to have an active cooling system, consisting of a fan and heat sink.