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Air-purifying vs. Atmosphere-supplying Respirators   Air-purifying Respirators   Atmosphere-supplying Respirators have filters, cartridges, or canisters that remove contaminants from the air by passing the ambient air through the air-purifying element before it reaches the user. supply clean air directly to the user from a source other than the air surrounding the user. Learn about the 3 different kinds of Air-purifying Respirators Learn about the 3 different kinds of Atmosphere-supplying Respirators