I don't understand your description. What does your porch have to do with your crawl space? Wherever you were going to place your fan blowing in, just turn it around. You can temporarily nail some random stuff around it to make it a little more air tight. Do you have a way for fresh air to get in from the other side of the crawl space?
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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