The two main types of RPE are respirators and breathing apparatus.
Respirators (filtering devices) use filters to remove contaminants from the air being breathed in. They can be either:
Breathing apparatus needs a supply of breathing-quality air from an independent source (eg air cylinder or air compressor).
Respirators and BA are available in a range of styles, dividing into two main groups:
Loose-fitting facepieces rely on enough clean air being provided to the wearer to prevent contaminant leaking in (only available as powered respirators or BA). Examples are hoods, helmets, visors, blouses and suits.