Nbc filtration systems

Abstract

A collective NBC filtration system (FIG.A) for providing positive-pressure purified air to a plurality of subjects in a protected space, or in an environment which cannot be maintained at positive pressure, in conjunction with one or more facepiece fluidly connected to the NBC filtration system. The system comprises: A casing body [] including a first section [] defining an inner volume therein, and a second section [] adjacent to the first section. The second section includes an inlet port [], The first section has a larger cross-section than the second section, and forms a peripheral first ledge [] surrounding the second section. At least one NBC filter accommodated in the inner volume. The at least one NBC filter is supported on the first ledge [], A lid [] including a central portion [] and a second ledge [] surrounding the central portion. The central portion [] includes a plurality of outlet ports [], which are sealable. The lid [] is openable to provide access to the inner volume and is securely closeable to affix the at least one NBC filter therein the inner volume by the second ledge [], The lid [] and the at least one NBC filter define, when the lid is securely closed, an outlet compartment there between. The outlet compartment has about the same cross-section as the second section. A blower [housed within the second section. A suction port of the blower being fluidly coupled to the inlet port. The system is configured such that the second section [fluidly couples the inlet port [to at least one inlet of the respective at least one NBC filter, and, when the lid [is securely closed, the outlet compartment [fluidly couples at least one outlet of the respective at least one NBC filter to the one or more outlet ports [but is otherwise fluidly sealed, thereby preventing potentially contaminated air from entering the outlet compartment, except via the at least one NBC filter.