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Polish Au-2 escape respirator. Escape breathing apparatus, also called escape respirators, escape sets, self-rescuer masks, emergency life saving apparatus (ELSA), emergency escape breathing devices (EEBD), and Respiratory Protective Smoke Escape Devices (RPED), [1] [2] are portable breathing apparatus that provide the wearer with respiratory protection for a limited period, intended for ...
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SCBAs usually come with full-facepieces, [15] but can also come with half-mask or mouthpiece in demand or pressure-demand mode, though use of mouthpieces are limited to escapes only, as of 1987. [4] Hoods and helmets are limited to continuous flow mode only, and are also used in air-line respirators in addition to escape-only SCBAs. [4] [16]
An escape respirator may have no component that would normally be described as a mask, and may use a bite-grip mouthpiece and nose clip instead. Alternatively, an escape respirator could be a time-limited self-contained breathing apparatus. For hazardous environments, like confined spaces, atmosphere-supplying respirators, like SCBAs, should be ...
Breathing apparatus are used for mine escape and rescue, firefighting, or working in hypoxic or toxic atmospheres at pressures near to normal atmospheric pressure. These may supply breathing gas at a slight overpressure, also known as positive pressure , to prevent contamination by ambient gas, as leakage from the breathing set is generally ...
Pressure-demand respirators supply air only when the pressure in the wearer's mask drops (that is, when they inhale). This saves air but allows more inwards leakage. [ 4 ] [ 1 ] [ 2 ] Pressure-demand respirators can only be used with a sealed elastomeric mask, not with a loose-fitting hood [ 4 ] (like those used in powered air-purifying ...
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