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Sorry but it really does matter which wire. The fan will be DC (direct current). It is not a major problem. once installed hook up the wires and if the fan is blowing the wrong way reverse the wires. Keep in mind when installing that the fan will probably be marked which way the air should pass through. Make sure it is pointing to the top of the bator.
Sorry I did give wrong info. Chicken Rustler is correct, I made this mistake the first time I did this type of install and forgot about it.
Thanks CR, I would hate steer someone wrong.