When it comes to crawl space ventilation fans or encapsulation, one method really works best for the air quality of the whole home.
In the past, it was common practice for builders and homeowners to ventilate the crawl space via crawl space vents and ventilation fans. The theory was for the ventilation fan to move outside air through the space in an effort to keep the crawl space dry. However, in climates that are humid, this caused more problems than it helped. It drew in natural humidity, along with toxins, pests and environmental irritants from the outside air.
While the crawl space is below the home, much of the air from it does come into the home and can affect the health of those living within.
How Crawl Space Air Affects Home’s Air Quality
Many homes are constructed with a central air conditioning system. These systems suction power draws 50% of the air from the crawl space into the home. Therefore, if your ventilation fan has drawn in excess moisture and created a mold problem, you could be breathing in mold spores and other air pollutants.