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Quantitative Fit Testing

Understanding the method that delivers objective, documented proof that a respirator fits.

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What is Quantitative Fit Testing?

Quantitative fit testing uses instrumentation to measure the ratio of particle concentrations outside and inside a respirator, producing a numerical fit factor that objectively confirms how well the respirator seals to the wearer’s face. Unlike qualitative methods, the result does not depend on the test subject’s senses or responses.

When to Use It

OSHA requires documented, numerical fit factor results for full-face respirators

Programs where defensible, auditable records are a compliance requirement

High-risk environments where confirmed respirator fit is critical to worker safety

Any program ready to move beyond subjective pass or fail results

How It Works at a Glance

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Device Setup

Set up the AccuFit™ device and establish sufficient ambient particle concentration.
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Respirator Preparation

Prepare the respirator with the appropriate sample adapter or probe.
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Exercise Protocol

The test subject dons the respirator and performs a series of exercises.
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Particle Measurement

The device measures particle concentration inside and outside the respirator.
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Fit Factor Calculation

A fit factor is calculated from the ratio of those two measurements.
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Automatic Documentation

Results are automatically saved and stored for your records.
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Full Instructions

For complete setup and testing instructions, refer to the AccuFit™ Operation and Service Manual.

What You Need

AccuFit™ or AccuFit PRO™

Appropriate sample adapter or probe kit for your respirator type

Particle source (ambient or ultrasonic generator)

Fit Command Cloud software (included)

Operator familiar with the testing protocol

Recommended Devices

AccuFit PRO™ quantitative fit tester
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  • Quantitative testing for every tight-fitting respirator including N95s and elastomerics
  • Objective, documented fit factors automatically saved to your records
  • The right choice for mixed respirator programs requiring full quantitative coverage
More Info
AccuFit™ quantitative fit tester
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  • Quantitative testing for elastomeric respirator programs of all sizes
  • Fast, accurate results with a defensible fit factor on every test
  • The right choice for programs ready to move beyond qualitative methods
More Info

Frequently Asked Questions

  • What is quantitative fit testing?

    Quantitative fit testing uses a machine to measure the actual amount of leakage into the respirator facepiece, producing a numerical fit factor. This objective measurement removes the subjectivity of taste or smell-based methods.

  • Is quantitative testing required by OSHA?

    OSHA accepts both quantitative and qualitative methods for most respirators. However, quantitative testing is required for certain respirator types and provides stronger documentation for compliance audits.

  • How long does a quantitative fit test take?

    A typical quantitative fit test takes approximately 2.5 minutes using the OSHA 2019 protocol, making it faster than many qualitative methods while providing more reliable results.

  • What types of respirators can be tested quantitatively?

    Quantitative fit testing can be performed on all tight-fitting respirators, including full-face, half-face elastomeric respirators, and depending on the instrument, filtering facepiece respirators like N95s.

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