Originally Posted by CraigC
Nope, my shop vac has a bag. I'd be worried if ash started coming out of the exhaust. For anyone reading these exchanges, the ash is cold and the vacuum has no safety pictures or warning labels so common sense must be applied about using the vacuum.
Yep. I use a bag in mine as well. Still, the fine ash gets into the motor housing, on the ball and onto the inside surface.
The bag must allow air to pass through it. That's why some ash still gets past it.
I always blew mine out with compressed air when changing the bag. There were always fines inside. The cloud of ash was proof enough. It was quite obvious though, even before blowing it out.
If you say there are no fines in your motor housing, fines on the inside surface and all over the ball, you would not be honest.
I worked in a clean air production facility once and we used some of the finest filtering equipment money could buy. Vacuum was the method of material transport.
No matter how good it was, there was always some fines that got past the filtering medium. Always.