<p> Faceshields are included in this standard and must provide safety based mostly on an Arc Thermal Performance Value (ATPV), which is measured in calories per sq. centimeter (cal/cm2). A Respirator (technically, a Filtering Facepiece Respirator, or an FFR) is a gadget that's disposable half-face-piece non-powered air-purifying particulate respirators supposed to be used to cowl the nost