On mine that's configured as an exhaust fan, so is the PSU. They pull airflow from the vented panel on the right side of your image across the CPU heatsink area and vent out the left side of the case.
Edit: I have a pile of quiet Sunon maglev fans in the mail, I'll be modding mine next week or so when they arrive and I'll post with part numbers and temp/noise comparisons.
Edit: I have a pile of quiet Sunon maglev fans in the mail, I'll be modding mine next week or so when they arrive and I'll post with part numbers and temp/noise comparisons.
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