Which type of respirator is designed to filter out airborne contaminants?

• A. Supplied-Air Respirators (SARs)
• B. Air-Purifying Respirators (APRs)
• C. Supplied-Air Hoods
• D. Combined Respirators

Answer: (B)

Air-Purifying Respirators (APRs) are specifically designed to filter out airborne contaminants, making them essential for environments where harmful particles, gases, or vapors are present. These respirators work by using filters or cartridges that remove contaminants from the air before the wearer inhales. This capability is particularly vital in hazardous material situations where the air quality may be compromised by chemical, biological, or particulate hazards.

In contrast, Supplied-Air Respirators (SARs) deliver clean air from an external source rather than filtering existing air, which distinguishes them from APRs. Supplied-Air Hoods provide a similar function by supplying air but do so using a hood style that may cover more than just the breathing zone. Combined Respirators may incorporate features of both types but do not specifically focus solely on filtering airborne contaminants. Thus, the defining function of APRs as air filtering devices makes them the correct answer to this question.