Vacuum Cleaners with HEPA Filters for Clay Studios. It is critically imperative to avoid clay dust in any ceramics studio. Wet mopping is always the first line of defense against clay dust. When vacuuming, it is important to use a vacuum with HEPA rated filtration. HEPA rated means it removes the super fine particles which are the concern with clay dust. Here, Sheffield Pottery offers a number of appropriate portable HEPA vacuums for your clay studio or classroom.