Recently, many customers ask us for suggestion--what we should do if conveying medium has dust. As we all know, if there's dust or some particals in the conveying medium, it will effect the normal operating of roots blower. If the dust density is much larger, it would hinder the moving of impeller, even damage them.
If there's dust in the conveying medium, you could consider about adding a filter before the blower and clean it periodically. Or choose a centrifugal fan or other kind blower, which could resist dust in conveying medium.