110 CFM Power Crawl Space Fan Value:each and rated for medium to

and rated for medium to heavy foot traffic

and ready for a fast

accessory guard with vacuum port

Lava rock is available in two sizes and colors

110 CFM Power Crawl Space Fan Value:each and rated for medium toThe Tjernlund UnderAire Series V1 Crawl Space Ventilator is designed to circulate fresh outdoor air underneath homes and porches. Excessive humidity levels in Crawl Spaces is the leading cause of premature rotting of support columns, joists, floors and beam supports. Humidity can promote fungus growth and increased termite activity. Humidity may also cause plumbing failures due to rust and corrosion. Constant operation helps vent radon gases, treated