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The N95 mask fit test is the testing process used to assess the performance and effectiveness of N95 respirators or "N95 masks". N95 respirators are a type of personal protective equipment (PPE) designed to provide a high level of respiratory protection against airborne particles, including viruses and bacteria. The N95 designation indicates that the respirator is capable of filtering out at least 95% of airborne particles.

Fit Testing: Fit testing is a crucial aspect of N95 testing. It ensures that the respirator forms a tight seal on the wearer's face, minimizing the risk of airborne particles bypassing the filtration system. There are two types of fit testing: qualitative and quantitative. Qualitative fit testing involves the wearer detecting a test agent, while quantitative fit testing uses specialized equipment to measure the fit.

LA Fire Card offers qualitative fit testing with saccarin (sweet) solution.


Here is an overview of the qualitative fit testing process:

  1. Test Agent: A test agent is used during the fit testing process. Commonly used test agents include saccharin, Bitrex (denatonium benzoate), or irritant smoke. These agents are introduced into the breathing zone of the wearer to challenge the seal of the respirator.

  2. Hood or Enclosure: The individual undergoing fit testing wears a hood or is enclosed in a test environment. The hood is designed to contain the test agent around the head and face.

  3. Respirator Donning: The individual properly dons the N95 respirator according to the manufacturer's instructions. It is essential that the respirator is worn correctly, covering the nose and mouth and forming a tight seal against the face.

  4. Test Agent Introduction: The test agent is introduced into the hood or enclosure, creating an environment where the wearer may be exposed to the substance.

  5. User Sensation: The wearer performs a series of movements, such as talking, bending, and normal breathing. During these activities, the wearer pays attention to any signs of irritation, taste, or odor that may indicate a leak in the respirator seal.

  6. Fit Assessment: The fit tester observes the wearer's reactions and responses to the test agent. If the wearer detects the taste or smell of the test agent, it suggests that the respirator may not be providing a proper seal.

  7. Pass/Fail Criteria: Qualitative fit testing typically follows specific pass/fail criteria. If the wearer does not detect the test agent, and there are no signs of irritation, the fit test is considered successful. If there are indications of a leak or if the wearer detects the test agent, adjustments to the respirator or a different respirator model may be necessary.

Qualitative fit testing is a subjective method, relying on the wearer's ability to sense the test agent. Qualitative fit testing are essential components of a comprehensive respiratory protection program, ensuring that workers are adequately protected in environments where respiratory hazards may be present.

N95 respirators or "N95 masks" that pass these tests receive certification, indicating that they meet the required standards for filtration efficiency, fit, and other performance criteria. Users should only rely on certified N95 respirators for optimal respiratory protection.


Price: $65
Length: Approximately 10-15 minutes
Where: 1605 W Olympic Blvd Los Angeles, CA 90015
What to Bring: No items needed
How to Prepare: No food or drink at least 15 minutes before your appointment
How to Register: Click the "REGISTER NOW BUTTON" for available dates and times
Certification: Upon passing the test, students will receive a certificate which they can send to their employer, agency or school. 
Questions? Call or text (323) 327-6353 

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