Self-contained breathing apparatus and supplied air respirators are two types of:

Self-contained breathing apparatus and supplied air respirators are two types of:

• A. Self-contained breathing apparatus
• B. Atmosphere supplied device
• C. Mixed-respiration system
• D. Jet-assisted respirator

Answer: (B)

Respirators are categorized by where the breathing air comes from. Self-contained breathing apparatus and supplied-air respirators both deliver air from a source outside the worker’s immediate surroundings, so they are both considered atmosphere-supplied devices. An SCBA carries its air in a cylinder on the wearer, while a supplied-air respirator pulls air from an external source through a hose. This is different from air-purifying respirators, which filter the ambient air. Other terms like mixed-respiration or jet-assisted respirators aren’t standard classifications for these devices.

Respirators are categorized by where the breathing air comes from. Self-contained breathing apparatus and supplied-air respirators both deliver air from a source outside the worker’s immediate surroundings, so they are both considered atmosphere-supplied devices. An SCBA carries its air in a cylinder on the wearer, while a supplied-air respirator pulls air from an external source through a hose. This is different from air-purifying respirators, which filter the ambient air. Other terms like mixed-respiration or jet-assisted respirators aren’t standard classifications for these devices.