Help With 4028 Part Fan Code, Please?

Using the 4-wire Sanyo Part Cooling fan supplied by R-R in the V-Core 3.1 standard kit, I've got it wired up as shown at https://os.ratrig.com/doc/guides/4028
The voltage jumper is in the center position, as shown in the illustration, for 12 volts. When I edit printer.cfg > ### USER OVERRIDES section, I can't seem to get the [fan] code correct. Would some one help, please? THANK YOU!
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