There are two main types of fit testing used to ensure a respirator provides an adequate seal to the wearer’s face: Qualitative and Quantitative.

Qualitative Fit Testing (QLFT):
This method involves challenging the respirator’s seal using a substance that can be detected by the wearer through taste or smell.

• It is a subjective test, relying on the wearer’s senses to detect leakage.
• Only suitable for disposable dust masks (FFP1, FFP2, FFP3) and half face masks.
• Common test agents include Bitrex or Saccharin.

Quantitative Fit Testing (QNFT):
This method uses machines to measure the amount of leakage into the respirator and provides a numerical fit factor.

There are two commonly used quantitative methods:

Ambient Particle Counting (APC):

• Measures the concentration of microscopic particles inside and outside the respirator.
• Suitable for disposable, half face, and full face masks.

Controlled Negative Pressure (CNP):

• Measures the air pressure within the mask when the wearer holds their breath and detects leakage through pressure decay.
• Applicable only to half face and full face masks.

Key points:

• Qualitative testing is based on detecting taste or smell.
• Quantitative testing uses equipment to measure actual leakage.
• APC works for disposable, half, and full face masks.
• CNP is limited to half and full face masks.
• Proper fit testing is essential for respiratory protection effectiveness.

If you need further support, please contact our Technical Support Team using the email: technical@jspsafety.com or contact us via WhatsApp.