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QUESTION:get a half-dozen furnace filters ...
Take the 6 filters, stack 'em, and duct tape them (...
After a while, take off the first filter (the dirtiest) and
chuck it, and add a new clean one to the fan side of the stack,
and tape 'em back in place. Repeat as needed.
ANSWER: This plus another post indicating Woodsmith is selling a kit based on
3 furnace filters has me wondering. Furnace filters don't filter that
fine: the "real" airborne filtration systems use a furnace filter only
as a prefilter. Stacking a bunch of them won't block off that much finer
dust anymore than stacking 6 layers of window screen will block off water.
The "real" systems use a finer filter that has pockets, thus vastly
increasing the surface area, which is essential to prevent larger particles
from being forced through the filter. This last point makes me wonder if
the recently touted upgrade for the JDS system to a higher cfm rating
without a change in the filters is actually good.
I've read that the most hazardous particles are those under 10 microns -
usually too small to be seen. Just because the air looks clean apparently
doesn't mean it is.
On a side note, I recently upgraded my duct collector to use an Oneida
bag. The difference is astounding. And, thanks to the much larger surface
area of the Oneida bag over the stock bag, not only does it filter better,
it sucks better - it's like I upgraded the motor.
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