Air Systems Cleaning Specialist (ASCS) Practice Exam

Which option reflects a common practice to minimize HVAC system contamination?

1. Regular filter replacement

2. Installation of electronic air cleaners

3. Covering duct openings

4. Limiting airflow to decrease dust accumulation

The correct answer is: Regular filter replacement

Regular filter replacement is fundamental in minimizing HVAC system contamination. Filters play a crucial role in trapping dust, allergens, and other particulate matter from the air circulated through the system. Over time, filters can become clogged with debris, which not only reduces their effectiveness but can also strain the HVAC system, leading to reduced efficiency and potential system failures. By replacing filters on a regular schedule, homeowners can ensure that their HVAC systems operate efficiently while maintaining improved indoor air quality. While electronic air cleaners can help reduce airborne contaminants, they often require specific maintenance and may not be as effective as regular filter replacements in capturing larger particles. Covering duct openings is not an effective long-term solution, as it could impede necessary air circulation and lead to issues with pressure balance within the system. Limiting airflow can reduce dust accumulation in specific areas, but this practice can also lead to inadequate ventilation and a variety of comfort issues in the living or working environment.