The service manual recommends hitting the film channel with compressed air every couple of weeks. If you do that and keep it covered when not in use dust is not an issue.
The way the scanner deals with dust is by complaining that there's dust :-) (It doesn't have a special dust error, AFAIK, but it does do some checks that will end up failing if too much dust has accumulated.)
The way to avoid dust accumulation is to keep it covered when it's not being used. That works nicely and is a reasonable thing to do anyway.
Is there some active dust-off stage? The feeding channel seems all open and next to plastic, I'd guess static charge would attract dust specs.
Hard to miss those days with hours spent rubberstamping dust specs in photo editor.