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Old 23-02-2015, 03:17 PM
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Waxing_Gibbous (Peter)
Grumpy Old Man-Child

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Join Date: Jul 2009
Location: South Gippsland
Posts: 1,768
Well. Thank goodness that's clarified!
Blow I think. Simply because most manufacturers design them that way.
Suck sounds reasonable if you have an OTA with vents a both ends (Phhhwooooar!), but I suspect you'll get better, or at least faster, cooling by blowing on the mirror.
Could be wrong. Usually am.
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