Quantitative Fit Test (QNFT)
Safeopedia Explains Quantitative Fit Test (QNFT)The advantages of QNFT are that there is no limit of protection-factor, numerical results can be documented and there is no chance of user deception. The disadvantages are that it requires expensive equipment, a probe adapter and regular calibration.
During the test, a challenge agent is administered outside the face piece and the presence of the agent is detected and counted by an instrument.
There are three types of QNFT:
- Generated Aerosol: Uses corn oil and a photometer-based aerosol detector.
- Ambient Aerosol Nuclei Count: Uses laser technology to measure aerosol concentration inside and outside the respirator.
- Controlled Negative Pressure: Creates a vacuum in the mask and calculates airflow.
- 6 Personal Protective Equipment (PPE) Guidelines Every Employee Should Know
- Having a Good Respiratory Protection Program Saves Lives
- How to Complete a Respirator Fit Test
- Top 10 Tips for Increasing Warehouse Safety
- How to Select the Right Hand Protection for Chemical Hazards
- Heavy Metals and Respiratory Safety: What Manufacturers Need to Know