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As Marc said, Jaycar sell a range of small fans. I got 3 maglev fans for my 20" dob, and they also sell the switching components (separately) you need to get it wired up if you feel so inclined. It's a bit of a challenge if you're an electronics gumby like me though. The fans are very quiet with minimal vibration - you'll barely know they're on if you get a decent quality one.
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