Fujitsu primequest 2400E2 Design Manual page 57

2.9 FAN Unit (FANU)
A unit that contains only a FAN and can be installed in a PSU slot in which no PSU
is installed.
A total of six units between the PSUs and the FANUs must be installed.

For details on the number of FANUs that must be installed and the
installation slots, refer to "4.5.1 PSU Configuration" in "General
Description".
PRIMEQUEST 2000 Series Design Guide
A total of six units
between the PSUs and
the FANUs are installed.
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