www.pmmag.com/articles/88484-proset-fire-guard-washer-box
ProSet Fire Guard Washer Box
September 1, 2005

ProSet has fire-tested its new Fire Guard Washer Box for appliances such as washing machines and icemakers. It installs within a one- or two-hour rated gypsum wall using the same installation methods of non-rated plastic boxes, but without the need for stuffing fire-resistant material or caulking.
Circle 48