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The radon model power fan is used to
positively pressurize (blow air into) the crawl space in order to minimize
emission of radon from the soil. Radon is a colorless, odorless gas that
is a result of rock decomposition and moves strictly by pressure effects.
The major concern is the concentration level, which if high enough, has
been known to cause lung cancer. Some areas in the US are known to have
high levels of radon, while others do not. To determine if a particular
geographic location is known to have elevated concentrations, contact the
local or state government offices. The Environmental Protection Agency is
another source for information regarding radon and the test kits used to
measure concentration levels. If the suction model power fan is utilized
with a foundation that emits radon from the soil, the radon may be
preferentially drawn into the crawl space from the soil and radon levels
may become elevated.
If radon is not a problem, the suction
crawl space ventilators should be an acceptable means to accomplish a
powered crawl space ventilation system. This system should prevent any
crawl space air (moisture & odor) from entering the living space
above.
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Vents
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