Occupational Safety and Health Administration OSHA

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Respiratory Protection eTool

Respirator Change Schedules Decision Logic Flowcharts

The following flowcharts present a logic diagram for the development of a respirator cartridge change schedule. The diagram starts and then continues to various other sections. To jump to the next page, choose the link to the correct connector.

If you want to print the diagrams, you may have a problem with Flowcharts 2, 3, and 4 printing wider than a standard page. You can probably overcome this problem by: setting the margins in page setup to minimum values (0.25 inch or less), or by printing in landscape mode.

Go To Flowchart 1 Go To Flowchart 2 Go To Flowchart 3 Go To Flowchart 4 Main page
Text Version
  • Enter
    • Do you intend to use an APR?
      • Yes - Go to "Oxygen level is ≥ 19.5%"
      • No - This is only for APRs - END
    • Oxygen level is ≥ 19.5%
      • Yes - You cannot use an APR - END
      • No - Go to "Do you need to remove particulates?"
    • Do you need to remove particulates?
      • Yes - Go to flowchart 1
      • No - Go to "You will be using a gas/vapor respirator"
    • 1R You will be using a gas/vapor respirator?
    • 2R Do you know the contaminants present?
      • Yes - Go to "Do you know contaminant concentrations?"
      • No - Go to flowchart 2
    • 3R Do you know contaminant concentrations?
      • Yes - Go to "For a particular respirator you should assume worse case concentrations"
      • No - Go to flowchart 3
    • For a particular respirator you should assume worse case concentrations.
    • Assess workplace environmental factors (humidity, temperature) and workrate.
    • Go to flowchart 4
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