The thinking was that the vents allowed air to circulate under the house, keeping it dry.In fact, what happens in many locations is that moist outside air coming through the vents condensed or collected, causing corrosion, mold, mildew and rot. Illustration by Boatbuilder/ GNUA zillion years ago, before there were building scientists and houses were just built by carpenters and contractors (with few if any outsiders telling them how to do their jobs) a quality construction job included foundation vents into the crawlspace.
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