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  • Air-supplying respirators designed to prevent the wearer from inhaling airborne particles, gases, and/or vapors from the environment by supplying air either from a stationary source of compressed air or from a low-capacity emergency self-contained air container. These respirators usually include a mask, a portable air container that may be attached to the user, and a long hose that should be connected to a high-capacity compressed air source. Combined stationary source/emergency container respirators are intended for use for extended periods in an environment that is or may be immediately dangerous to life or health for the user (e.g., closed rooms with contaminated particles or hazardous chemical spills), providing a supplementary air supply that is enough to escape in emergency.
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