The irc prescriptions for venting crawl spaces are contained in section r408 in several paragraphs.
Attic crawl space ventilation.
Vents in the crawl space allow damp humid air to enter the crawl space where it will damage insulation and lead to mold growth.
The amount of ventilation required is 1 500 150 10 square feet.
While it may look dry looks are deceiving.
Set your store.
The minimum net area of ventilation opening must not be less than 1 square foot for each 150 square feet of under floor space area.
The under floor space between the bottom of the floor joists and the earth under any building except space occupied by a basement shall have ventilation openings through foundation walls or exterior walls.
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Silver galvanized steel crawl space fan vent model v2d 146 32 146 32.
Here is an example.
Of course sealing your crawl space vents isn t going to solve all your issues.
This moisture will eventually cause issues as well.
To convert to square inches multiply by 144.
The first paragraph of irc section 408 provides the standard requirement for ventilating crawl spaces.
A house has 1 500 square feet of crawl space area.