UnderAire Deluxe One Fan Crawl Space
Ventilator
Model V1D
UnderAire™ Series Crawl Space Ventilators are
designed to circulate fresh outdoor air underneath homes and 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 also cause plumbing failures
due to rust and corrosion. Constant operation helps vent radon gases, treated
wood off-gassing and other odors that might migrate into living areas.
Equipped with a factory installed and pre-wired
thermostat which will prevent operation of the fan below 35°F. Controlled by a
dehumidistat which actuates the fan if the relative humidity rises above the
selected set-point
The only line of crawl space ventilators with a
special "suitable for damp locations" ETL listing. This model features one fan
and large faceplate sized for ventilation openings through block foundations.
Includes thermostat, dehumidistat, and pre-wired 6" power cord. The ventilator
is installed inside crawl space behind existing ventilation opening. Screws and
masonry wall anchors are included.
Features:
- Galvanized faceplate may be trimmed if
necessary
- One fan
- Adjustable dehumidistat
- Sealed bearing motors
- Thermostat deactivates fan below 40°F to
avoid freeze-ups
- Grounded 6' power cord
Specifications:
- Capacity: 110 CFM
- Motor: 115 Volts ~ 50/60 Hz 0.30 amps
maximum
- Thermostat: On at 50°F Off at 35°F
- Dehumidistat: 20% - 80% RH Range
- Dimensions: 18” x 9” x 2”
- Warranty: One year
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Facts to know about Crawl Space
Ventilation:
- If soil is damp, as much as 20 gallons
of water per 24 hours can evaporate into the air in a 1,400 sq. ft crawl
space.
- Primary causes of excess moisture
include:
- Surface runoff water
- Poor ventilation
- No or poor ground vapor barrier
- Signs of excess moisture in crawl
space:
- Soil is wet
- Surface organism growth on floor
joists
- Wet insulation
- Musty odors in crawl space or living
areas
- Excessive moisture in living areas
tending to migrate towards windows
From Mississippi State University Extension
Service |
How to determine the number of UnderAire
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. ÷ 15 minutes = 160 CFM of ventilation.
Choose two V1 or V1D ventilators or one V2D ventilator.
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