dustfaq outdated? Filter factor for pleated cannisters?
 

Hi all,

I'm getting close to buying a DC system that will be for a fixed
ducting arrangement in my home/hobby shop.

I'm leaning heavily towards the Penn State DC2000BCF - has the 1um
pleated cannister filter up top (83 sq.ft. surface area), plastic bag
below.

In calculating my SP requirements, the dust FAQ (yes, I see it's dated
May 2000) at http://mypeoplepc.com/members/dstig/dustfaq_2.html

mentions the filter factor. Says a 30 micron bag counts 1" SP, BUT for
a 5 micron bag you should deduct 30% from the final working CFM, and a
1 micron bag cuts the effective CFM in half!?!? ... Can that be right?
Or is that assuming a 1 micron BAG - with its limited surface area -
as opposed to a pleated cannister?

I spoke w/ Bill at PSI, and asked him what the equiv. SP-inches is for
the exact cannister for the DC2000. He had to check and call me back,
and did, and said to allow/factor one-HALF inch SP for the filter
factor.

That's a helluva lot different (better) than a 50% cut in effective
CFM.

I see in the FAQ that the author seems to address this in the "Better
Filter Bags" section; and he makes special note of the Onieda Cyclone
w/ pleated filter, "unlike any system currently available."

Can someone help clarify this for me?

Thanks,
Chris