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Old 08-28-2006, 02:52 PM   #1
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cooling fans

How big of fan do i need to properly cool my 2 250w metal halide bulbs, i'm planning on using two, one to pull in and one to push out. Also what do i use to power them.Thanks
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Old 08-29-2006, 08:38 AM   #2
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Are you running open top, or is there glass on the bottom side?

Do you have any experience designing DC circuts?

Any old DC transformer of the right voltage will work for power. I have a small pile in the attic that used to belong to phones, radios, etc. You know, the big squarre box that plugs in to the wall, and has a slender cord and a round end that goes into a device? The voltage needed should be stamped on the fan. If you can't find one of the right voltage, a lower voltage one will just run the fan slow, a higher voltage one can be wired with some resisters in series with the fan. Radio Shack will have transformers if you can't find one you're not using.
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