What is the maximum hose length allowed by NIOSH when using an airline hose respirator?

What is the maximum hose length allowed by NIOSH when using an airline hose respirator?

• A. 100 feet
• B. 300 feet
• C. 500 feet
• D. 1000 feet

Answer: (B)

Airline respirators rely on a steady flow of air from a source through a hose to the wearer. The longer the hose, the more resistance and pressure drop occurs, which can reduce the amount of breathing air delivered when the user is working hard. To ensure the wearer consistently receives adequate air and remains protected, NIOSH sets a practical upper limit on hose length. That limit is 300 feet, balancing workable distance from the air source with maintaining sufficient airflow and pressure at the respirator. Hose lengths longer than this risk insufficient air, compromising safety. Therefore, the maximum allowed length is 300 feet.

Airline respirators rely on a steady flow of air from a source through a hose to the wearer. The longer the hose, the more resistance and pressure drop occurs, which can reduce the amount of breathing air delivered when the user is working hard. To ensure the wearer consistently receives adequate air and remains protected, NIOSH sets a practical upper limit on hose length. That limit is 300 feet, balancing workable distance from the air source with maintaining sufficient airflow and pressure at the respirator. Hose lengths longer than this risk insufficient air, compromising safety. Therefore, the maximum allowed length is 300 feet.