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There are several types of inlet coverings (how the respirator attaches to the user) for air-purifying respirators.  For non-powered air-purifying respirators, these include either a filtering facepiece, a mouth-bit, a quarter mask, a half mask, or a full facepiece.  For powered air-purifying respirators, these include a half mask, a full facepiece, a hood (loose or tight fitting) or a helmet (loose fitting).

A respirator inlet covering is the portion of the respirator that forms the protective barrier between the userís respiratory tract and an air-purifying device or breathing air source, or both.  It may be a facepiece, a helmet, a hood, a suit, or a mouth-bit with a nose clamp.