Text equivalent of “Knowing the Difference: Fit Test vs. User Seal Check”

[Logo: AgriSafe Network, Protecting the People Who Feed the World.]

[Introduction]

A respirator can’t protect you if it doesn’t fit your face.

Fit Test

  • Performed once a year or when a new respirator will be used.
  • Performed by a trained person.

There are two types of fit test: quantitative and qualitative. Qualitative fit test are most common in small businesses. OSHA doesn’t require fit test administrators to be certified, just to know how to conduct and interpret a test with appropriate testing equipment.

Qualitative (pass/fail)

  • Bitrex, Saccharin, Banana Oil / Smoke.
  • Use OSHA approved fit testing protocols.

Before an employee uses any respirator with a tight fitting face piece, the employee must be fit tested with the same make, model, style, and size of respirator that will be used.

User Seal (Fit) Check

  • Performed every time a respirator is worn.
  • Performed by the wearer (once properly trained).

Seal checks are not a regulatory substitute or alternative to fit tests.

Positive pressure check

  1. Block the exhalation valve cover with the palm of your hand.
  2. Exhale gently into the facepiece, creating a slight positive pressure.
  3. If you can feel air leaking under the facepiece, reposition it and repeat steps one and two until you have an effective seal.

Negative pressure check

  1. Cover the inlet openings of the cartridges or canisters with the palms of your hands and inhale gently so that the facepiece collapses.
  2. Hold your breath for about ten seconds. The seal is effective if the facepiece stays collapsed.
  3. If the facepiece expands or you can feel air leaking under the facepiece, reposition it and repeat steps one and two.

*If repositioning the respirator does not resolve the air leak for the positive or negative pressure check, try a different N9 5 size and or model respirator.

[The Fine Print]

This material was produced under grant number S H – 0 5 1 7 2 – S H 9 from the Occupational Safety and Health Administration, U. S. Department of Labor. It does not necessarily reflect the views or policies of the U. S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.

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