Automatic Temp-Vent is a revolutionary type of foundation ventilator for the crawl space under a home - it opens and closes by itself. Temp-Vent automatically helps prevent excess dampness under your home. Dampness leads to foundation decay. Homeowners spend annually $1billion repairing foundation decay. Dampness leads to unhealthy molds which can cause asthma and hay fever. Dampness hinders your termite control program. Temp-Vent will help protect and preserve the wood in your home by controlling dampness Temp-Vent automatically helps prevent pipe freeze-up. Temp-Vent automatically stops wasted fuel ($$) and heat loss due to open manual vents. Available in Black, Brown, Grey or White