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Home>>Information >>Design information
Foundation Vents - Temp Vent Design Specifications

To determine the correct number of Power Temp-Vents, use the following formula:

  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 ó depending on which model is being used ó to obtain the number of power vents needed.

  4. Install Automatic 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 exhaust.

Calculating how many foundation vents are needed.

Example: 1500 square foot crawl space x 3 feet high = 4500
4500 cubic feet x 6 = 27,000 / 7,200 = 3.74
Install 4 powered vents with 4 non-powered intake vents on the opposite side

Power vents should be placed on one side of the house with non-powered vents that act as intake vents, on the other side.

If installing vent in a below grade foundation, a vent well is needed.
Click here for vent well information.

Please choose model type below when ordering.

Note: The operation of this temp-vent may be loud when installed in a wood stud wall. To reduce noise, install in a concrete or cinder block foundation wall.

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 ground, 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.





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The foundation is critical to the integrity of the home. Thatís why foundation vents and ventilation are 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. Whatís more, ventilation can help control conditions that lead to mold, mildew, fungi, damp rot and unhealthy air. Buy Tempvents brand foundation vents.
But thereís more. If thereís one thing termites are attracted to, itís warm, moist, dead air environments such as those found under houses in crawl spaces or unfinished basements. TempVent products have been especially designed for the pest control industry.
Temp-Vent foundation vents help to provide ventilation that can reduce moisture in these areas, which helps control termites.