Mold Remediation Certification Practice Exam

When and how should the NAM pre-filter be changed?

1. Before containment starts

2. After containment is completed

3. In containment while running

4. Once a day

The correct answer is: In containment while running

The correct approach for changing the NAM (Negative Air Machine) pre-filter involves making adjustments while the equipment is actively running in containment. This is crucial to maintain air quality and control the spread of mold spores during the remediation process. When the negative air machine is operating, it continuously filters and traps airborne contaminants, including mold spores. If the pre-filter becomes clogged or excessively dirty, it can impede airflow, reduce the machine's efficiency, and potentially allow spores to escape from the containment area. Therefore, changing the pre-filter while the machine is running helps ensure that the air remains as clean as possible during the remediation effort. Changing the pre-filter before containment starts would not be effective, as pollutants could be introduced immediately upon beginning the project. Similarly, changing the filter after containment is completed negates the primary purpose of the negative air machine, which is to maintain safe air quality throughout the process. While a daily change could be considered in certain high-contamination environments, it is not a standard procedure and can lead to unnecessary downtime, unlike changing the filter in real-time during operation.