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Sucking or blowing ambient air would produce the same cooling for the volume of air moved across the mirror regardless of the direction. However, as Ian has said when sucking from an enclosed system there is a pressure drop inside which will cause a drop in efficiency of the fan. If the fan was blowing then this inefficiency would not be there BUT if the air cannot get past the mirror quick enough then you will have back pressure which will reduce the efficiency as well. Is the mirror that tight in the OTA ie. <20mm clearance? If not then blowing should be more efficient for cooling.
Cheers
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