Commodity Fumigation License Practice Exam

Which test can be used every time you wear a respirator to check fit?

1. Visual inspection

2. Negative pressure test

3. Sound test

4. Temperature test

The correct answer is: Negative pressure test

The negative pressure test is the correct choice for checking the fit of a respirator before each use. This test helps ensure that the respirator forms a proper seal against the face, which is crucial for effective filtration and preventing contaminants from entering the respiratory system. During the negative pressure test, the wearer covers the filter or cartridges with their hands and inhales sharply. If the respirator seals correctly, it will collapse slightly, indicating that the negative pressure is being maintained within the mask and no unfiltered air is entering. This simple yet effective method allows individuals to assess their respirator fit each time they don it, ensuring reliability during the course of their work. While visual inspection is important for identifying any obvious damage or wear on the respirator, it does not provide a definitive assessment of fit. The sound test and temperature test are not recognized standard methods for fit checking and may not provide accurate feedback on whether the respirator's seal is intact. Thus, the negative pressure test remains the most suitable option for verifying proper respirator fit regularly.