ProSet has announced its Hi-Temp PVC Fire-Tested Washing Machine Box. No more jury-rigging, stuffing with fire resistant material and caulking to satisfy building inspector code requirements when using a product that has not been tested. You can now make sure that the fire-rated wall rating is not reduced when installing ProSet's washer/utility box. ProSet has successfully fire tested its new plastic F.R. Utility Box that can be used within a one- or two-hour rated gypsum wall in accordance with the ASTM E-814 fire test standard. ProSet Systems.