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RE: Air Filter Collection Efficiency
- To: radsafe <RADSAFE@romulus.ehs.uiuc.edu>
- Subject: RE: Air Filter Collection Efficiency
- From: "Aaron Chen 609-540-4448, 609-472-0046(cell)" <Aaron.Chen@usa.dupont.com>
- Date: Wed, 26 Nov 1997 11:13:00 -0500 (EST)
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Keith,
Depending on the type of filter, your efficiency should
almost always go up with time. In fact, in industrial
hygiene, we depend on certain filter systems to load up
to improve the efficiencies over time. Each filter, will
of course, load up differently, based on what the air
flow rate is, what the loading or mg/m^3 is and what the
average particle size is vs. the filter size, fabric
weave and thickness of the filter.
So, there are a number of things to consider, but bottom
line is that filters do usually improve in efficiency
over time, sometimes quite dramatically.
Aaron Chen, CIH
DuPont, Jackson Lab, 4127 (D)
Chambers Works
Deepwater, NJ. 08023
609-540-4448
Aaron.Chen@ USA.dupont.com