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I think blowing air past them would be more efficient . . . There is more air movement on the pushing side of a fan because it is more focused. Move air faster, and the air around the motor will stay nearer to room temp, sucking heat faster than it would if it was a shade warmer, as it would be drawing air past because the air in question would be in contact with the motor longer because it isn't moving as fast.
Of course, you have five muffin fans, mor max cooling I would recommend doing both - one sucking and one blowing.
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