If you just need a quickey, Gore Industries makes an after market filter
for Shop-Vacs. They rate it at over 99.9%. It has a low delta P and can
be washed for reuse. Our local OSHA tested it and it passed muster. It
is not quite as good as HEPA, but it is 1/10 the cost.
David Maxfield
INCRE, LLC
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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