Using a fan for cardio? yes / no.

Here's a question for the real experts! (I haven't found much online)
right now, my primary exercise is using my treadmill. I do various settings, still pretty slow though, but this applies to all cardio or stationary machine workout.
Is it okay to use a fan during your workouts? (my treadmill...

Source: http://weight-loss.fitness.com/weight-loss-through-exercise/47093-using-fan-cardio-yes-no.html

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