Respirable air under suitable pressure should be delivered to each respirator at a volume of at least what?

Respirable air under suitable pressure should be delivered to each respirator at a volume of at least what?

• A. 4 CFM
• B. 6 CFM
• C. 8 CFM
• D. 10 CFM

Answer: (B)

The idea is to ensure the supplied air is enough for breathing under normal and heavier work conditions. For respirators that rely on a dedicated air supply, the system must deliver a steady flow to meet the wearer’s breathing demands. The minimum flow rate specified for each respirator is six cubic feet of air per minute. This rate accounts for increased ventilation during exertion and helps keep the regulator and hose pressurized so the facepiece stays comfortable and sealed, preventing draw-in of contaminated air. If the flow were lower, the wearer could experience insufficient air supply during heavy breathing and the facepiece might not maintain a good seal. A higher flow is acceptable and provides more assurance, but six cubic feet per minute is the established minimum that satisfies safety and functionality without being overly excessive.

The idea is to ensure the supplied air is enough for breathing under normal and heavier work conditions. For respirators that rely on a dedicated air supply, the system must deliver a steady flow to meet the wearer’s breathing demands. The minimum flow rate specified for each respirator is six cubic feet of air per minute. This rate accounts for increased ventilation during exertion and helps keep the regulator and hose pressurized so the facepiece stays comfortable and sealed, preventing draw-in of contaminated air.

If the flow were lower, the wearer could experience insufficient air supply during heavy breathing and the facepiece might not maintain a good seal. A higher flow is acceptable and provides more assurance, but six cubic feet per minute is the established minimum that satisfies safety and functionality without being overly excessive.