The Tjernlund Under Aire™ fan-powered ventilator protects your home and family by quickly reducing moisture in crawl spaces. This increased air circulation prevents mold, mildew, condensation and wood rot. It also helps vent radon gas, treated wood gases and odors, preventing them from entering your living spaces and threatening your family's health.
Deluxe two-fan ventilator
Built-in DE humidistat
Freeze protection thermostat
Sealed bearing motors for long life
Mounts into ventilation openings in block foundations
Galvanized faceplate can be trimmed to fit. Faceplate is 18"x9"