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Well I agree with the OP.. I have 8 HEPA asbestos vacuums which are the Nilfisk  and yes they have bags and a large cotton filer and a motor filter sock and a HEPA filter on top of the motor.  I am a prying finger kind of guy, took the bottom motor cover off of one of my Nilfisk and it is almost pristine, just a little carbon dust.  I agree with bags.  My patriot is bagged but the person that had it before me only used the filer cloth bag and look what a disaster that was.  Though how much damage can house dust do to your lungs, when you are outside in the wind with dust or pollen or car exhaust.  Pets are stinky but don't think a carcinogen.