We have a crawl space in our basement that has a vent... basically a rectangular hole with a grille over it. Is this something we can permanent seal up? Is it necessary to have or needed by code? It is making it difficult to control the humidity and is causing mold growth. We haven't used a dehumidifier yet, because we figured what's the use with hole in the wall letting in humid air. I am concerned about the musty, mildewy and mold that I smell and see. I am having paranoid vision of what is lingering behind the drywall and plywood walls.
We really would like to get control of the situation... any suggestions would be greatly appreciated.
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