In re-entry into a foam-filled building during an emergency, which respirator is required?

In re-entry into a foam-filled building during an emergency, which respirator is required?

• A. Canister-type gas mask
• B. Self-contained breathing apparatus (SCBA)
• C. Open-circuit air-purifying respirator
• D. N95 filtering facepiece

Answer: (B)

Entering a foam-filled building during an emergency can expose you to an atmosphere that may be oxygen-deficient and contain toxic gases from the foam. In these conditions you need a respirator that supplies air from a separate source, not one that filters the surrounding air. A self-contained breathing apparatus provides its own air from a cylinder and delivers it to the wearer, offering protection against both low oxygen and a range of gases and vapors. The other options rely on ambient air and filtration, which isn’t sufficient here: canister-type gas masks and open-circuit air-purifying respirators depend on the surrounding air and filters, which won’t guarantee safety in unknown or oxygen-deficient environments; an N95 filters only particulates and offers no protection against gases or low-oxygen situations.

Entering a foam-filled building during an emergency can expose you to an atmosphere that may be oxygen-deficient and contain toxic gases from the foam. In these conditions you need a respirator that supplies air from a separate source, not one that filters the surrounding air. A self-contained breathing apparatus provides its own air from a cylinder and delivers it to the wearer, offering protection against both low oxygen and a range of gases and vapors. The other options rely on ambient air and filtration, which isn’t sufficient here: canister-type gas masks and open-circuit air-purifying respirators depend on the surrounding air and filters, which won’t guarantee safety in unknown or oxygen-deficient environments; an N95 filters only particulates and offers no protection against gases or low-oxygen situations.