Tjernlund UnderAire Crawl Space Exhaust Fan Model V1D 110 CFM

Specifications

The Tjernlund UnderAire™ Series Crawl Space Ventilators are designed to circulate fresh outdoor air underneath homesand porches. Excessive humidity levels in Crawl Spaces is the leading cause of premature rotting of support columns,joists, floors and beam supports. Humidity can promote fungus growth and increased termite activity. Humidity may alsocause plumbing failures due to rust and corrosion. Constant operation helps vent radon gases, treated wood off-gassingand other odors that might migrate into living areas. Deluxe models (V1D & V2D) are controlled by a dehumidistat whichactuates the fan if the relative humidity rises above the selected set-point. MODEL V1D Ventilator:Capacity: 110 CFMMotor: 115 Volts ~ 50/60 Hz0.30 amps maximumThermostat: On at 50°FOff at 35°FDehumidistat: 20% - 80% RH RangeDimensions: 18” x 9” x 2”Mounting Plate SmallestTrimmable Dimensions: 9 3/4” x 6” RECOMMENDED VENTILATION RATE:Calculate the cubic area of the crawl space by multiplying the length x width x height. Divide this number by 15 to determinethe 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 V2Dventilator.

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