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Originally Posted by stringscope
2X80mm boundary layer fans blowing across the face of the mirror. appropriate vents on the opposite side of the mirror box.
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You would be much better off with the fans close to the mirror edge sucking air and blowing it out of the mirror box. This keeps the airflow laminar and will ensure that the mixed tempertaure air exits the box cleanly.
To have fans blowing will create a turbulent mixture of cool and warm air in the mirror box which wont help views at the eyepiece.
I think the ideal arrangement might be to have a couple of small low powered fans to "dig up" the boundary layer, and then a number of more powerful fans to suck that air out of the mirror box.