Foundation Vents - Air Vents for Crawlspaces
and Basement Walls - TempVents
Manual and powered temp vent foundation vents, available
to the public,
including Radon Vents...
The foundation is critical to the integrity of
the home. That’s why foundation ventilation is critical.
Unventilated foundations are subject to built-up moisture that can
eventually lead to costly damage.
Temp Vent foundation vent systems help protect this critical area of the
home. What’s more, ventilation can help control conditions that lead to
mold, mildew, fungi, damp rot and unhealthy air.
But there’s more. If there’s one
thing termites are attracted to, it’s warm, moist, dead air environments
such as those found under houses in crawl spaces or unfinished basements.
Temp-Vent products have been especially designed for the pest control
Temp-Vent foundation vents help to provide ventilation that can reduce
moisture in these areas, which helps control termites.
|Specifying a Temp-Vent System
When you recommend Temp-Vent foundation ventilation products, you
can install an automatic, non-powered foundation vent system or
electrical powered ventilators.
Specifying a Temp-Vent foundation
vent system is simple. All vents are sized to fit 8" x 16" openings
with 1” outside frame on each of 4 sides. However, the design of the
system and the number of vents required are different for powered
and non-powered vents.
Automatic Foundation Vents
The non-powered, Automatic Foundation Vent will open and close
automatically using a heat/cold sensitive coil. The louvers open
completely at approximately 72°F and completely close at approximately
38°F. Unlike manual vents that can waste energy when no one remembers to
open or close them, these vents self-adjust all year long.
Whenever possible, vents should be placed on all sides of the
foundation. This will create an intake/exhaust system that delivers a
steady flow of air. One vent should be installed for each 8 to 10 feet
of foundation wall.
Most building codes require 1 square foot of open ventilation area for
every 150 square feet of crawl space. Temp Vent Automatic Foundation
Vents have 50 inches of net free area per vent. Therefore, you should
install one vent for every 50 square feet of crawl space.
For crawl spaces with polyethylene installed, on 80-90% of the floor,
the ventilation requirement changes to 1 square foot of ventilation for
every 500 square feet of crawl space with a minimum of 4 vents installed
to provide cross ventilation. For crawl spaces with polyethylene,
install at least one vent for every 500 square feet of crawl space.
Installation Tips for Automatic
||For proper ventilation, one vent should be
installed every 8-10 feet.
||Avoid dead air spaced by placing vents within 3
feet of each corner.
||A minimum of 4 vents are required to provide
||Dense shrubbery should be trimmed for the vents to
Power Foundation Vents
Powered Temp-Vent systems are designed for foundations that
require a higher rate of airflow and for areas that are difficult to
vent. Depending on the model they can move large amounts of air per
hour. Designed to run continuously on a low speed, they draw minimal
electricity. However, Temp-Vent recommends power vents be fitted with a
thermostat and a humidistat to control the operation of the vent.
To determine the correct number of Power Temp-Vents, use the
1) Multiply the square feet of the crawl space by the height in feet.
This gives the number of cubic feet in the crawl space.
2) Multiply the cubic feet in the crawl space by the number of air
changes per hour desired (4-6 is the recommendation). This gives the
total number of cubic feet of air that has to be moved per hour to
produce the desired number of air changes.
3) Divide this number by either 7,200 or 11,160 — depending on which
model is being used — to obtain the number of power vents needed.
4) Install vents to provide air intake on one side of the foundation
with the power vents on the other side to create a system of intake and
many foundation vents are needed.
square foot crawl space x 3 feet high = 4500
4500 cubic feet x 6 = 27,000 / 7,200 = 3.74
Install 4 power vents with intake vents on the opposite side