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We have a relatively new house (built in 2002) with a cold storage room under the poured concrete porch. There is a door with full weatherstripping leading to it.

We'd really like to close it off (it has two vents to the outside) and turn it into a storage room (unheated), but not open to the outside to help control humidity levels. It's a relatively dry room (no pooling of water or anything).

What's the best way to close off the two vents that go outside? They are about 6 inches in diameter and about 8 inches deep (from memory, it may be more). Or should they not be closed off?

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What is the floor in that room made of? –  bib Nov 1 '13 at 14:57
    
Walls and floor are poured concrete as well. –  Daemonic Nov 1 '13 at 15:03
    
There's a lot of variables involved with moisture control. You may find it is better to have vents part of the year and be closed off the rest. Don't do anything permanent, unless it's operable. Some XPS foam plugs should suffice. –  bcworkz Nov 1 '13 at 16:42

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