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Tjernlund Deluxe UnderAireT 110 CFM Crawlspace Ventilation Fan. Single fan and large faceplate sized for ventilation openings through block foundations. Includes thermostat, dehumidistat and pre-wired 6' power cord. Fan powered crawl space ventilation quickly reduces moisture helping to protect both home and occupants. FEATURES and BENFITS: * Ventilates excess moisture, the cause of mold, mildew and wood rot. Increases air circulation to fight condensation. * Constant operation helps vent radon, treated wood offgassing and odors that might otherwise migrate into living areas. * Galvanized face plate may be trimmed if necessary * Includes adjustable dehumidistat with automatic low temp shut off & restart switch (40 F off, 50 F to turn back on) to avoid freeze up * Includes mounting hardware and installation / owners manual SPECIFICATIONS: Performance: 110 CFM Dehumidistat: Off/On or 20% - 80% RH Thermostat: Opens at 40 degrees F Dimensions: 18" x 9" x 2" .30 Amps Maximum How to determine the number of UnderAireT Ventilators needed: Calculate the cubic area of the crawl space by multiplying the length x width x height. Divide this number by 15 to determine the minimum CFM necessary to fully ventilate the space in 15 minutes. Example: 20' wide x 40' long x 3' high crawl space = 2,400 cubic ft. 2400 cubic ft. divided by 15 minutes = 160 CFM of ventilation. Choose two V1 or V1D ventilators or one V2D ventilator.

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