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  • Devices designed to provide respiratory protection. They may prevent the device wearer from inhaling dangerous particles, gases, and/or vapors from the environment. Respirators may be designed to remove particles (e.g., dusts, mists, some bacteria), gases/vapors, or both; typically, the user can attach the respirator to his/her face without help from another person. Some devices filter the ambient air before it reaches the respirator user; others supply clean air directly from a source different than the surrounding air. Respirators are mostly used in emergency situations to protect people from inhalation of bacteria, contaminated particulates, and gases and/or vapors from chemical spills.
  • Respirators designed to prevent the wearer from inhaling airborne particles, gases, and/or vapors by filtering the environmental air. These respirators typically consist of a filtering facepiece (e.g., mask) that includes air-purifying devices (e.g., filters, cartridges, canisters) that remove the contaminant before it reaches the user.
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