Cleveland Cavaliers; Detroit Pistons; Milwaukee Bucks; Indiana Pacers; Southeast; Atlanta Hawks; Charlotte Hornets; Miami Heat; Orlando Magic; Washington Wizards; Southwest; Dallas Mavericks; Houston Rockets; Memphis Grizzlies; New Orleans Pelicans; San Antonio Spurs; Northwest; Denver Nuggets; Minnesota Timberwolves; Oklahoma City Thunder; Portland Trail Blazers; Utah Jazz; Pacific; Golden State Warriors
So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
1 The exhaust air would carry out 14 gallons of water. 2  The incoming air would carry in 15 gallons of water. 3  An uncovered soil crawl space would produce 18 gallons of water.  So, even though the exhaust air carried out 14 gallons, the space actually carried 19 gallons of water into the building.