First off, check that your fan is in the list of allowed fans in the next-to-last row of table 4-1, in R18.
Quote:
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Hard drive motors or fans that are included in the 2015 Kickoff Kit, 2015 FIRST Choice, are a part of a legal motor controller (including manufacturer provided accessories), or COTS computing device
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So, fans are considered motors.
Then, check R42 for which loads can be controlled from the PCB. I see solenoid valves, solenoids, and custom circuits, but no motors (other than the compressor).
From a practical standpoint, all of the solenoid ports put together are only rated for 500mA
(See the last line of the table at 1.2 of the PCM manual). Only the smallest fans are going to draw less than this and leave you enough capacity to safely use the solenoids.