3M’s full facepiece FR-M40B along with the 3M brand canister FR-15-CBRN is a lightweight respiratory protection system that is NIOSH-approved for use in chemical, biological, radiological and nuclear (CBRN) environments. Ideal for first responders, the FR-M40B assembly consists of a silicone facepiece, eyepiece outserts and a butyl rubber second skin.3M OH&ES, St. Paul, MN.