Fujitsu SPARC ENTERPRISE M9000 Service Manual page 519

Because the FANBP is a built-in unit in the cabinet, only cold replacement is
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available for the FANBP.
FANBP connects FAN unit to the cabinet.
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Up to 10 FAN units can be mounted on FANBP_A, and up to six FAN units can be
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mounted on FANBP_B and FANBP_C each.
The FANBP has circuits mounted for monitoring the fan rotation speed, switching
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between high/low speed, and controlling the CHECK LED. It is controlled by the
XSCF.
The FNBP has a label bearing the printed component number and manufacture's
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serial number.
Appendix B Components B-41