The hud standard typical of others recommended four crawl space vents with a total minimum free vent equal to 1 150 of the crawl space floor area if there is a ground cover 1 1500 with the ground uncovered.
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Crawl space recessed foundation vent cover shallow depth black for 8 x16 foundation openings cover only.
In the summer the warm highly humid air outside of the house is drawn into the colder less humid crawl space.
Even though crawl space vents are code in many areas the science behind the subject is now showing the complete opposite of the above statement.
If however you cover the bare ground in your crawl space with an approved vapor barrier material you only need 1 square foot of vent for every 1 500 square feet of space.
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Automatic air vents are used for ventilating your crawlspace to help control moisture that can lead to mold fungus damp rot poor air quality and possible moisture damage.
The 8 x16 manual air vent with removable cover easily fits over standard 8 x16 foundation openings in the crawl space or foundation of a home.
The manual air vent with removable cover is flush mount which means it can fit over most openings even if they are slightly larger or smaller than 8 x16.
The code also requires that there be one ventilated opening near each corner of the building.