The companion documents to INDG479 outline the main recognised methods for conducting fit testing on respiratory protective equipment (RPE). These documents provide detailed guidance on how to carry out each method appropriately to ensure a proper fit and protect the wearer from respiratory hazards.
The three fit testing methods identified are:
Qualitative Fit Testing (QLFT)
This is a subjective method that relies on the wearer's response to a test agent, such as a bitter or sweet-tasting aerosol. It is typically used for filtering facepieces and half masks.
Quantitative Fit Testing (QNFT)
This objective method uses specialised equipment to measure the level of leakage into the facepiece. It can be used for all types of tight-fitting respirators, including full-face masks.
Controlled Negative Pressure (CNP)
This is a specific type of quantitative method. It assesses the fit by measuring how well a mask maintains a vacuum when subjected to a negative pressure environment. This method is less commonly used but is recognised as a valid testing option.
Each method has its own procedures and appropriate applications depending on the type of RPE being tested. It is essential to select the correct fit testing method for the specific RPE in use to ensure user safety and compliance.
Key points:
- INDG479 companion documents list three fit testing methods: QLFT, QNFT, and CNP.
- Qualitative Fit Testing is a subjective method using taste or smell.
- Quantitative Fit Testing uses instrumentation to measure mask leakage.
- Controlled Negative Pressure is a specialised quantitative test method.
- Proper method selection depends on the type of RPE used.
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