Originally Posted by pondering_it_all
Nice to know: I didn't used to be allergic to mice, but since we moved into our current house I am very reactive. Apparently our bathroom fan pulls air up from under the house. If I'm in there with the fan on for even 30 seconds, my nose starts running like crazy.

Far as I remember there's some obscure code about refitting fans that source from a crawlspace because of that very thing.
God help me if I can remember the specifics though.

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