Mitigation codes require that fan
placement insure that no leakage from the fan can re-enter the
space inside the home. For this reason the mitigation fan placement
is restricted to a few
specific areas which will be determined by the design of the home.
Fans are typically going to be installed
in an attic, a garage (which is not under a living area such as
a bedroom or play room). If neither of these locations can be
used the fan can be placed on an exterior wall. The first challenge
for any system design is to find a path
way through the structure that is efficient and UN- obtrusive.
Care must also be taken in deciding where
to locate the vent stack which will exhaust the gases collected
from beneath the structure. The emissions at the stack contain
concentrated doses of radon which will measure in the hundreds
of picocuries, as well as other soil contaminants. Placement of
the exhaust stack must be at least 10 feet above the ground and
ten feet away from windows, and exhaust stacks that might permit
the gas to re-enter the structure. The gases will dissipate safely
beyond ten feet in open air.
Consequently the design of your home is going
to have an impact on how and where a radon system is installed