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Air flow across the front of the mirror to break up the boundary layer only improves the image when the mirror is still cooling down.
But, having one fan in front of the mirror as well as the one behind can speed up the cooling process. More important if your mirror is thicker than 1.5 inches.
The slight warping of the figure of the mirror as it cools down is more important in the process of figuring. In the field the effect is much less important than the heat waves coming off the mirror.
A small fan on the back of the average 10 inch should be plenty.
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