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[ATM] RE: Cooling Fans

I use two cooling fans on my 12.25" truss dob to blow air across the 
face of the mirror; one pulls air in and the other pushes it out. They 
are surplus computer fans that draw 0.16 amps each, at 12 volts, and I 
power them from two 6 volt lantern batteries in series. They cause no 
vibrations and they are on the whole time the telescope is set up. I 
estimate battery life to be in excess of 10 hours.
Gil
Port Orange, FL

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