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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.
Best Answer: Crawl space can be used to describe either a low ceilinged access space beneath a structure or above it. Crawl basement sort of limits the description to just being beneath the structure. There is such a thing as a crawl-space, which is underneath a house. It's usually not called a basement. This usually exists on houses that are not on top of a cement slab. It's just like it sounds. Usually there are air vents, and you have to go up a few steps to get in the house.