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While it was important for him to add a sump pump there, the most important part had been the air vents. There is no way you can last long down there without fresh air, so he added two 12-inch vents at the front and back.
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Clearly, he added this because it might be necessary to spend a long time there. Did you think that he already had everything in check? However, Wayne did not take any chances. The ground can shift and move, especially during the winter.