There are two major classes of respirators; one is air-purifying, the other is…
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Respirators do one of two things – supply clean air or purify the air you breathe.
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Correct answer is:
The two major types of respirators are: (i) air-purifying respirators that remove air contaminants; and (ii) atmosphere-supplying respirators that deliver clean, breathable air supplied through an uncontaminated source.