Tjernlund UnderAire™ Crawl Space Ventilator — Deluxe One Crawl Space Fan, 110 CFM

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.