Which statement is true about APRs in relation to air supply?

Which statement is true about APRs in relation to air supply?

• A. They rely on a continuous external air cylinder
• B. They filter ambient air
• C. They provide 100% oxygen
• D. They require no maintenance

Answer: (B)

Air-purifying respirators work by filtering contaminants from the air in the surrounding environment. They rely on the oxygen already present in the ambient air rather than supplying their own oxygen, which is why the statement about filtering ambient air is true. They don’t provide 100% oxygen, and many APRs require regular maintenance—filters or cartridges need to be replaced, seals checked, and the device cleaned. They also don’t rely on a continuous external air cylinder, which would be the case for supplied-air systems or SCBAs. In short, APRs purify the air around you rather than delivering oxygen, making filtering ambient air the correct characteristic.

Air-purifying respirators work by filtering contaminants from the air in the surrounding environment. They rely on the oxygen already present in the ambient air rather than supplying their own oxygen, which is why the statement about filtering ambient air is true. They don’t provide 100% oxygen, and many APRs require regular maintenance—filters or cartridges need to be replaced, seals checked, and the device cleaned. They also don’t rely on a continuous external air cylinder, which would be the case for supplied-air systems or SCBAs. In short, APRs purify the air around you rather than delivering oxygen, making filtering ambient air the correct characteristic.