There are two recognised types of respirator fit testing: qualitative and quantitative. Each method has its own application and is suited to different types of respirators.
Qualitative Fit Testing:
This method relies on the wearer detecting a test substance by taste. If the wearer can detect the substance while wearing the mask, it indicates a poor fit.
- This method is subjective and depends on the wearer’s ability to taste the test agent.
- It is only suitable for disposable dust masks (FFP1, FFP2, FFP3) and half masks.
- It is typically used with substances like Bitrex or Saccharin.
Quantitative Fit Testing:
This method provides an objective measurement of the fit by calculating a numerical fit factor. It uses advanced technology to measure the amount of leakage into the respirator. There are two main techniques:
- Ambient Particle Counting (APC):
- Measures the concentration of particles outside and inside the mask to determine the fit.
- Suitable for disposable dust masks, half masks, and full face masks.
2. Controlled Negative Pressure (CNP):
- Measures the airflow needed to maintain a constant negative pressure inside the facepiece.
- Applicable to half masks and full face masks only.
Key points:
- Fit testing is essential to ensure a respirator provides adequate protection.
- Qualitative testing uses taste and is only for disposable and half masks.
- Quantitative testing provides a numerical result using either APC or CNP methods.
- APC can be used for disposable, half, and full face masks.
- CNP is only suitable for half and full face masks.
If you need further support, please contact our Technical Support Team using the email: technical@jspsafety.com or contact us via our WhatsApp.