The short answer is no. Wind slits are often unnecessary and detract from your visual impact. The exception are large banners installed in windy conditions.
Small Boulevard Pole Banners, for example, are typically displayed without wind slits and due to their size (small in width) they hold up well. Depending on the area you live in, the size of the banner and the method of display, your graphics may need wind slits.
Consult your representative for specific advice on your outdoor graphics.
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