The PC fans I have only have a red and a black lead - no third wire. So I think you can ognore the white. Now, being a DC fan, if it is hooked up one way, fan will push, but if hooked up opposite it will pull. Should be easy to figure out.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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