Motorola PATX3070 Series Installation And Use Manual page 56

Features and Specifications
3
3-6
A power supply fan and a chassis fan may be required to properly cool any
expansion modules (AGP cards, PCI cards, and ISA cards). The
PATX3070 provides headers (J10, J15) to power these fans if necessary.
While the exact amount of airflow required for cooling depends on the
ambient air temperature, enclosure venting, and the type, number, and
location of expansion modules and other heat sources, an average airflow
of 40 CFM (cubic feet/minute) should provide adequate cooling for most
applications.
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