What is the rule of thumb for crawlspace vents?

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My house was built 30 years ago on a crawlspace. The crawl space has about a dozen vents in the brick foundation. I live in central Arkansas, and it is very humid in our state. I have had conflicting advice on leaving the vents open vs. close. What is the rule of thumb on this matter? We have a tendency to get some standing water under the house during certain rainy spells.


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