Red Seal Sheet Metal Worker Practice Exam

To ensure good air quality in a duct system, what routine maintenance is necessary?

1. Regular cleaning and maintenance

2. Annual inspections only

3. Replacing filters every five years

4. Using air fresheners regularly

The correct answer is: Regular cleaning and maintenance

Routine cleaning and maintenance are essential for ensuring good air quality in a duct system. Dust, allergens, and other contaminants can accumulate in the ducts over time, affecting the performance of the HVAC system and potentially leading to health issues for occupants. Regular maintenance, including the cleaning of ducts, registers, and fans, helps to remove these contaminants and promotes efficient airflow. Additionally, this regular upkeep allows for the early detection and resolution of any potential issues, such as mold growth or pest infestations, that could further compromise air quality. Furthermore, regular maintenance includes checking and replacing air filters as part of the process, which also contributes significantly to maintaining optimal air quality and system efficiency. Other options would not provide the same level of assurance for air quality. Annual inspections alone may not be frequent enough to prevent the buildup of contaminants, while replacing filters every five years does not align with the recommended practice of changing them according to the specific needs of the system or usage conditions. Using air fresheners does not address the actual sources of air pollution and could introduce more chemicals into the environment.