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Tjernlund Deluxe UnderAire™ 110 CFM Crawlspace Ventilation Fan

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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.

* 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

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.