has anyone tried a cyclonic attachment for their shop vac for cleaning out their pellet stoves? something like this http://www.woodcraft.com/PRODUCT/20...ode=10INGOPB&gclid=CKTu8LqajLQCFQmCQgodvicAKw i have a shop vac going with a HEPA filter, but it clogs quickly. i've just read about putting a drywall bag on the filter to extend filter life. i'm going to try that, but i'm curious if the cyclone lid would get most of the offending particulates before they hit the filter. they're most often used for sawdust, as i understand it. as long as the ash was cool, seems like they might be similar.