Airline supplied air is not commonly used for emergency response because they are limited to only _______ ft.

• A. 100 ft
• B. 200 ft
• C. 250 ft
• D. 300 ft

Answer: (D)

Airline supplied air uses a continuous hose from a remote air source to the respirator, so how far you can move is limited by the hose length and pressure loss along that hose. The usable distance is around 300 ft because beyond that the air pressure at the user’s mask can drop too low to supply safe breathing, and the operator becomes heavily tethered, making rapid movement and maneuvering in emergencies unsafe and impractical. Shorter distances would imply a more generous range than is actually reliable, which is why the commonly accepted limit is 300 ft.