Atmosphere-Supplying Respirator No. 3: Combination Respirators
The third atmosphere-supplying respirator is the combination respirator. Combination respirators have an "auxiliary self-contained air supply." This is for use if the primary respiratory system fails. They are often used to enter confined spaces and in atmospheres which are (or might be) immediately dangerous to life and health (IDLH).
As it only needs to supply enough air to escape a dangerous area, the self-contained portion is typically small.
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