SmartVent is the smart way to seal the crawl space from outside humidity and vermin but it also allows flood water to enter the crawl space when necessary. This is important as we have seen in the past where heavy floods have put pressure on foundation walls and caused bowing walls in the basement or crawl space. By allowing flood water to enter, the pressure on your foundation walls is greatly reduced, yet it keeps your crawl space sealed as well, allowing for our system to reduce humidity and reduce the risk of mold and wood rot.