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Powered air-purifying respirator
:''For the full-body lab garment with similar purpose, see ''Positive pressure personnel suit''.''
A powered, air-purifying respirator (PAPR) is a type of personal protective equipment used to safeguard workers against contaminated air. PAPRs consist of a respirator in the form of a hood, or full-face mask, which takes ambient air that is contaminated with one or more type of pollutant or pathogen, actively removes (filters) a sufficient proportion of these hazards, and then delivers the clean air to the user's face and/or mouth. PAPRs are sometimes called positive-pressure masks, blower units, or just blowers.
==Description==
There exist different types of PAPR units for different working environments. Regardless of type, a PAPR consists of (1) some kind of headgear (mask or hood), (2) a powered (motor-driven) fan which forces incoming air through (3) a filter (or multiple filters) for delivery to the user for breathing, and (4) a battery or other power source. The mask may be hard and tight-fitting or flexible and loose-fitting. (The former affords a higher level of protection, but is less comfortable.) The fan, filter, and power-pack may be carried around freely by the user, often secured by a belt around the waist. Alternatively, with certain units, the air is fed to the user via lengthy tubing while the fans and filters are remotely mounted.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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