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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.
The outdoor air leaving the wheel can only get as dry as the exhaust air. entering side. The exhaust air comes from the space. Thus, at best, the outdoor air leaving the. wheel can only get as dry as the space, but no drier. If supply air is no drier than the space, it cannot. dehumidify the space.