[GrizHFMinimill] Anyone ever replace the noisy cooling fan in the controller box

I know I'm being a whiner but that cooling fan has a nasty startup noise. It has always done that and always calms down after a few minutes. But, it's so easy and inexpensive to replace (I'm guessing) that I thought I might try a new one. Does anyone have any recommendations? Any info on any interesting specs would be great too -- size, bolt pattern, CFM if that really matters, and voltage (which I think is 12 based on other posts).

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