The PBF gas mask is a gas mask that originated in the Soviet Union during the Cold War. It was intended to be a lightweight gas mask that did not have a heavy metal canister filter or tube. Instead, the PBF uses two smaller EO-19 'cheek' filters mounted on each side of the mask. The PBF's voice emitter and exhale valve are located behind a plastic cover at the front of the mask. The PBF's lenses are designed to be used by soldiers that must look down optical devices, as the lenses are not angled. A notable feature of the PBF is the fact that it has indentations meant to fit over the wearer's ears. The material in this area is also thinner, to aid in hearing. According to some sources, the filters of the PBF are meant to last as long as 7 days, depending on the level of air contamination. According to some sources, the PBF was called the 'gorilla', 'monkey' and 'hamster' mask by Soviet troops. The PBF is still used by police forces in some former Warsaw Pact countries, due to its light weight.
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