The maximum hose length allowed by NIOSH when using an airline hose respirator is ________ feet

The maximum hose length allowed by NIOSH when using an airline hose respirator is ________ feet

• A. 200
• B. 250
• C. 300
• D. 400

Answer: (C)

In a supplied-air (airline hose) respirator, the length of the air supply hose directly affects how much air actually reaches the facepiece. The longer the hose, the greater the friction and pressure drop along the line, which can reduce the breathing air flow and pressure delivered to the wearer. To ensure a safe and reliable air supply while still allowing reasonable mobility, NIOSH sets a maximum hose length of 300 feet. This limit helps maintain adequate air flow under typical work rates and movement. Shorter lengths are fine and common, but 300 feet is the longest allowed; going longer, such as 400 feet, would exceed the standard and risk insufficient air delivery.

In a supplied-air (airline hose) respirator, the length of the air supply hose directly affects how much air actually reaches the facepiece. The longer the hose, the greater the friction and pressure drop along the line, which can reduce the breathing air flow and pressure delivered to the wearer. To ensure a safe and reliable air supply while still allowing reasonable mobility, NIOSH sets a maximum hose length of 300 feet. This limit helps maintain adequate air flow under typical work rates and movement. Shorter lengths are fine and common, but 300 feet is the longest allowed; going longer, such as 400 feet, would exceed the standard and risk insufficient air delivery.