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It's best to have the fan blowing air onto the back of the mirror, as this is the quickest way to cool it down. The air should flow around the edge of the mirror and exit out the front of the OTA. This is how the fans work most efficiently.
If you try to suck the air into the front of the tube, not only will it take longer to cool the primary down, I think you will find you will end up with a very dirty mirror very quickly.
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