It has two different fan ports: Original square 4pin fan port: For Antminer L9, S21, T21, KS5, KS5PRO, AL1, AL1PRO, S19jxp, S19kpro, etc.
Original MARTECH 12V 4.5A 7000RPM fan for Antminer S19kpro S21 S19jxp KS5pro
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