Quick question
Which way should the air blow? Does it even matter? Is there a more energy efficient configuration that reduces fan load or there is no difference?
Make sure the fan is blowing out, if it blows in, the air builds up in the motor and it implodes and starts a black hole.
Do your homework.
I don't want to seem mean but, you really need to do some more homework.
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It will turn the same way no matter how you hook it.Switching wire doest change direction on 120v.It does on 3 phase 440v but really dought if you have that.