The point is that if the issue is that you need to avoid
having debris like leaves falling into the pipe, that can
be solved with a simple screen or cap. A simple
screen cover could even be in the diagram you
provided, just not shown. It's just a simple wire
So, yeah, I'd say someone who instead proposes extending the pipe up
above the height of the trees is probably a hippie.
All systems must account for water, condensation or rain. It's real dum to
put an open pipe sticking up. It's also real dum to use a large diameter
pipe. It does not depend on fan size, it's all about how much flow you get.
I put up a pipe with a bend above roof. I have a water collection system
for condensation. It's easy to clog. I only have to run the system in the
colder months, and a bug screen is necessary. My 120 cfm German fan is
pulling about 20-30 cfm, at 1 inch pull.
My radon is 1.5 in the summer without fan. In winter it could jump to 20
times that without fan.
It's useful to understand why radon is so dangerous.
The gas itself is inert. But it has a relatively short half life
before it decays and become a metal. Basically, a radon atom
"instantly" becomes a radioactive metal. Within a few days half of
that first decay product has become a very slightly radioactive form of
lead with a half life measured in decades.
The "key" to solving radon problems is to dilute it to near background
atmospheric levels. At much higher levels folks just breathing in &
out will end up with trace (but measurable) amounts of radioactive lead
in their lungs. It's almost a recipe for lung cancer.
As I see it, there isn't much point in letting the vent pipe clear the
trees. You house foundation (with your house) has been trapping radon
inside. But much of the soil in "hot spots" routinely gives off radon.
Your vent gives off no more than a lawn the same size as your basement.
The outlet is on the outside of the foundation wall, behind a heavy
hedge of evergreens. No one ever goes there except to pick up
accumulated wind-blown trash every once in a while (three times a year
maybe). So, I don'tt think anyone is going to get contaminated unless
they are homeless and set up a tiny tent behind the hedges so that no
one can see them.
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