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Particulary in electronics, and other devices, its customary to force air onto the device or surface to be cooled. I'd have thought the reciprocity theorem would have applied and it wouldn't matter, but the experts believe different. I understand when sucking away from the mirror, a vacuum or void will occur particulary in the centre where little air movement takes place so cooling is not as efficient. Try reversing the fan and see if you notice the difference. Do you have temp sensors mounted?
Regards IanG
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