Combination Ventilation System

Effective Air Exchange. As the exhaust device creates a slight negative pressure at the basement floor removing the polluted basement and crawl space air, the dirty, damp crawl space air is replaced with conditioned air from the living space above via the booster fan, and the dirty, damp basement air is replaced with the air drawn down the basement staircase from the upstairs. This air exchange effectively removes the odors, mold spores, allergens, air borne contaminants, etc. from the basement and crawlspace and exhausts them to the outside resulting in a much-improved indoor air quality in both spaces.

Why Replacement Air Matters? Any ventilation is only as good as the conditioned replacement air, a good source of conditioned air will deliver the best results. Crawl spaces must have all vents to the outside sealed closed to ensure no air communication from the outside. A secure vapor barrier or concrete floor will be required for best results, as well as no water intrusion in the basement or crawl space.

When the crawl space is sealed from the basement, and they are two independent spaces, we recommend a ventilation system for both spaces, a basement system as well as a crawl space system in order to treat both spaces with ventilation and conditioned replacement air.