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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.
Installs on inside or outside of crawl space opening or against a joist near Dead Spots. Air flow (CFM) of Fresh Air Supply Fans can be matched with air flow of Crawl Space Fans. Heavy duty galvanized steel construction. It can be painted.