The Tjernlund company has been manufacturing oil fired forced air furnaces since the late 1930's as well as customized roof top heating and cooling equipment. In the 1950's the company grew their range to include products which could be used to effectively eliminate draft problems in roof top units. Today, seventy-two years later, Tjernlund has launched their crawl space ventilation system which is able to control and reduce moisture and dampness in the crawl space of a building. If you are battling with controlling the moisture in a crawl space, and looking for a product which is able to eliminate crawl space moisture, the Tjernlund website, www.tjernlund.com, will show the crawl space ventilation system. The crawl space ventilation system is a fan system that has been proven to reduce crawl space moisture and should moisture be present in a crawl space, the result will be a damp crawl space and this can lead to many problems, including health problems for the occupants of the home, as well as structural rot that will cause the building to become unstable. In light of the fact that the crawl space ventilation fans are in constant operation, the fans are able to assist with circulation of air and this action is what will reduce the moisture in the crawl space. In addition, however, the crawl space ventilation fan will also help to vent radon, treated wood, off gassing and other odors which may have an effect on the health of the home's occupants.