Ambient air cleaner help please.
My Grizzly G9956 air filter is a workhorse and does a good job of air filtration. The problem is the pre filter is an odd size that I haven't been able to find anywhere except at Grizzly. They're not washable (the inner bag is however and filters the smaller "stuff"). I've been thinking if I could find some thin washable foam I could save a few bucks and not have to replace the prefilter as often. Anybody know of a source for this kind of foam or washable filters? The pre filter measures about 19 X 15 1/2.