Tag Archives: Biological Threat

Came across a good PDF from FEMA that outlines the different classifications of safe rooms and how to make one in your home for protection against chemical, biological and radiological (CBR) threats. This is a single chapter from a larger document, and begins: “A CBR safe room protects its occupants from contaminated air outside it by providing clean, breathable air in two ways: (1) by trapping air inside the room and minimizing the air exchange (an unventilated safe room) and (2) by passing contaminated air through a filter to purify it as it is supplied to the room (a ventilated … Continue reading →