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Test in the Correct Order

You must always test the air in a confined space in THE FOLLOWING ORDER:

  1. Test for proper oxygen levels.
  2. Test for flammables and combustibles.
  3. Test for toxic gases (such as hydrogen sulfide or carbon monoxide).

IMPORTANT: Many oxygen or combustible meters will not work or will display incorrect readings if the air has insufficient oxygen. ALWAYS MEASURE OXYGEN FIRST!

To learn more about Firefighter Confined Space visit our Firefighter Confined Space Entry & Rescue Online Training web page.

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