If you want a hardware solution, I would suggest a couple of Zalman "FanMate"(s).
this way you could "dial" in the optimum speed.. noise /cooling..
On my OpenBSD email server I have 2 "cheap" 80mm fans (case was free) and I have these
controlled via FanMates...
IIRC, the cost was something like 3-4 USD..
rk
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