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Chris, this might appear to be an old topic but there is plenty of new thoughts on it. Fans for removal of boundary layer problems really is not addressing the real issue. Mirrors will release heat for hours and hours if no active cooling takes place. Fans at the rear of the mirror are certainly a step closer to getting the mirror to ambient, but there are faster methods. Peltier cooling takes care of this problem. It gets your mirror to ambient quickly and allows more time for viewing and imaging or whatever you prefer. It does require power which can be problematic but the results will be worth the effort.
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