Layer width shrinks/expands when cooling bridges on top of infill

Im printing PETG in an enclosure, at 80/235. Im printing without the fan on, but I have to turn it on for bridges (first layer on top of infill). When the fan kicks on, I think it cools the newly added wall layer, and creates a difference in how molten the next layer is or something. Is there a way to avoid this?
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