Under the CSA Standard Z94.4 – Selection, Use and Care of Respirators, fit testing is mandatory for all workers who wear tight-fitting respirators.

The test ensures the respirator achieves an adequate seal before use in the workplace, in accordance with provincial Occupational Health and Safety (OH&S) requirements.

Our Fit Testing Service Includes:

• Scheduling and managing fit test sessions

• Performing the full set of standard exercises during testing

• Ensuring tests use the same make, model, style, and size of respirator used on the job

• Re-testing annually or when facial changes, weight shifts, or respirator changes occur

• Interpreting results and recommending alternate respirators or adjustments if required

• Providing certification and documentation for your respiratory protection program

Which Test Is Right for You?

Qualitative (QLFT): Ideal for N95 and half-face respirators in lower-risk environments.

Quantitative (QNFT): Recommended for high-risk settings, full-face or PAPR use, and when precise compliance data is required.

Qualitative Fit Testing (QLFT):

This is a pass/fail method of testing that relies on the wearer’s ability to detect a test agent—by taste, smell, or irritation—to identify leaks.

If the wearer detects the test agent, the respirator does not fit properly.

Best suited for:

• N95 and half-face respirators

• Lower-risk work environments where qualitative results are acceptable

QLFT is quick, cost-effective and ideal for confirming the fit of negative-pressure respirators.

Quantitative Fit Testing (QNFT):

This method of testing uses specialized instruments—such as a particle counter or controlled negative pressure equipment (e.g., TSI PortaCount™)—to measure the amount of leakage between the face and the respirator.

This method generates a numerical fit factor by comparing particle concentrations inside and outside the mask, providing accurate, objective results.

Required for:

• Full-face respirators

• Tight-fitting powered air-purifying respirators (PAPRs)