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So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
In areas where thereâs very high outside humidity during the summer, ventilating the crawlspace can bring more moisture into the space than it removes. Soil evaporation also can be a significant source of crawlspace moisture. In some areas, the water table is within three feet of ground level. With a 3-ft. water table, the ground can evaporate up to 12 gal. of water/day in a 1,000 sq.ft. crawlspace area.