Air Systems Cleaning Specialist (ASCS) Practice Exam

Which situation would require the removal and replacement of duct insulation?

1. Minor discoloration

2. Insulation becoming wet

3. Presence of dust

4. Surface stains from airflow

The correct answer is: Insulation becoming wet

The situation requiring the removal and replacement of duct insulation occurs when insulation becomes wet. Wet insulation can lead to a variety of problems, such as the growth of mold and mildew, which can cause health risks and reduce indoor air quality. Furthermore, wet insulation can lose its thermal resistance properties, resulting in decreased energy efficiency for the HVAC system. It is crucial to address this issue promptly to maintain both the safety of the building's occupants and the system's operational efficiency. In contrast, minor discoloration, the presence of dust, and surface stains from airflow may not necessarily indicate a failure in insulation that requires removal and replacement. These conditions could often be addressed through cleaning or minor repairs without needing to replace the insulation entirely.