Re: So I'm curious
> the normal trick for dustproofing
Keeping it in a dustproofed area is the only guarantee.
Failing that, a room or section of room with something simple like net curtains at the doorway is enough to stop plaster (top quality fine dust) floating through and coating everything - though don't use too small a space for your dust-free zone (e.g. the space under a desk) as the this is enough to restrict the external airflow and put the temperature up by 10-20 degrees and in an already-warm environment that might be all it needs.
Assuming you can't add an intake fan with a replaceable filter.