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Barbara, I think that you will find that the 400 cfm fan is
inadequate for your needs. I don't know how many square feet are
contained in your studio but much of the power of the fan (hp) will
be used up by the friction loss of the duct work. Air is like very
thin water and offers resistance to the side of the duct just like
the surface of a pipe or hose offers resistance the flow of water. In
order to provide adequate flow for all of your various desires,
soldering hood, polishing station and general room exhaust, you will
most likely need much more then the 400 cfm that you have allocated
with the fan you have chosen. That cfm listed is with no duct work
attached to it, no resistance. Air is different then water in the
fact that it is compressible and water is not. With this in mind
there is a possibility that you could have no air being exhausted out
of the studio. If you look at a wood working dust collection system
for design purposes you will see an approximation of the size of fan
and duct work needed to have a satisfactory system. I suggest that
you use a furnace pre- filter for the polishing station. My personal
guess of a fan is in the area of 800 to 1,200cfm, more towards the
higher number I think.
Good luck with your system, Jerry
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