Tjernlund UnderAire Model V4D Crawl Space Ventilator Fan 540 CFM
Specifications
| Return Shipping Will Be Paid By | Buyer |
| All Returns Accepted | Returns Accepted |
| Item Must Be Returned Within | 30 Days |
| Refund Will Be Given As | Money Back |
| Brand | Tjernlund Products |
| Power Source | Corded Electric |
| Voltage | 120 V |
| Cooling Capacity | 540 CFM |
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. The (V4D) is controlled by a dehumidistat which actuates the fan if therelative humidity rises above the selected set-point. MODEL V4D Ventilator:Capacity: 400 CFMMotor: 120 Volts ~ 50/60 Hz0.24 amps maximumThermostat: On at 50°FOff at 35°FDehumidistat: 20% - 80% RH RangeDimensions: 18” x 11” x 4”Mounting Plate SmallestTrimmable Dimensions: 12 1/2” x 10 1/2” RECOMMENDED VENTILATION RATECalculate 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: 30’ wide x 50’ long x 3.5’ high crawl space= 5,250 cubic ft. 5250 cubic ft. divided by 15 minutes = 350 CFM of ventilation. Choose two V2D Ventilator or one V4D.