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I think Henry has a thermal cutout, if not you could overheat it.
It does, if this happens you can just change the bag and wait for it to cool down. You can tell it's coming though as it gives out a lot more heat.
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Plaster and brick dust can be fine enough to travel through the bags and motor which can prematurely wear the motor out.
The filter protects the motor.
Fox
@Airhead
The problem with hoover bags is the fine dust clogs the pores. Sanding paint is not as bad as plaster for clogging. A Henry should manage it as long as the bag doesn’t split but it becomes a bit less efficient as the bag get clogged up which might make the motor heat up a bit moire than usual. I think Henry has a thermal cutout, if not you could overheat it. My hoover (not Henry) will turn off after about an hour of sanding in summer heat.
Plaster and brick dust can be fine enough to travel through the bags and motor which can prematurely wear the motor out.