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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.
â Rebecca, Plymouth, ME. A: Richard Trethewey replies: You can run a duct in a crawl space, but you must take some precautions. First, the duct should be insulated for two reasons: to keep the heat in the duct until it can get to the room and to keep the duct from sweating and rotting away. A hot duct in a very cold space can cause water vapor to settle along the duct, causing rust (on metal ducts) and mold (on any duct).