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Ventilates excess moisture -- a
cause of mold, mildew and wood rot. Increases air
circulation to fight condensation.
Constant
operation helps vent radon, treated wood off-gassing
and odors that might otherwise migrate into living
areas.
The only crawl space ventilators with a special "suitable
for damp locations"
ETL listing.
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.
V1
(110 CFM) |
One fan and small faceplate for
ventilation openings through brick foundations.
(Requires switch or dehumidistat to activate.
Multiple ventilators may be controlled by a single
switch or dehumidistat). Includes freeze protection
thermostat.
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V1D
(110 CFM) |
One fan and large faceplate sized
for ventilation openings through block foundations.
Includes freeze protection thermostat, dehumidistat and pre-wired 6’
power cord.
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V2D
(220 CFM) |
Two fans and large faceplate sized
for ventilation openings through block foundations.
Includes freeze protection thermostat, dehumidistat and pre-wired 6’
power cord.
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V1, V1D, V2D Literature |
V1, V1D, V2D Instructions
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DH10 |
Dehumidistat for crawl
space ventilator. Adjustable up to 80 percent
humidity.
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DH10
Instructions
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UnderAire™
Foundation Vent The UnderAire™
crawl space vents can be used to provide
foundations with passive ventilation or can
be used along with a fan-powered crawl space
ventilator for maximum effectiveness.
These units not only
provide ventilation during the warmer
months, but also include a winter guard
which allows homeowners to fully seal the
crawl space during the heating
season--greatly improving the home's energy
efficiency.
Tjernlund UnderAire™
crawl space vents can be completely
installed from the outside of the crawl
space in minutes.
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- Increase crawl space air
flow to
decrease moisture
- Increase the effectiveness
of Tjernlund UnderAire™
powered crawl space ventilators
- Reduce
heat loss through crawl space
vents during the heating season
- Help
prevent pipes from freezing
- Open
and close easily from the
exterior
- Feature
a heavy duty screen and high
quality ABS
- Have a
clean, finished appearance with
a paintable frame
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FV1 Instructions
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