Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two Crawl Space Fan, 220 CFM, Model# V2D

Fan-powered ventilator quickly reduces moisture in crawl spaces to protect home and occupants. Increases air circulation to prevent condensation, mold, mildew and wood rot. Also helps vent radon gas, treated wood gases and odors, preventing them from migrating into living areas.