Which of the following is incorrect regarding air filters in gas systems?

The statement about cleaning air filters being unnecessary if they appear clean is incorrect. Regular maintenance of air filters is crucial for ensuring optimal performance of gas systems. Even if a filter looks clean to the naked eye, it can still be clogged with particles that may not be visible. These particles can impede airflow, negatively affecting the efficiency of the gas system and possibly leading to operational issues.

Replacing air filters on a routine basis, such as monthly, is considered a best practice to maintain air quality and system efficiency. Frequent replacement helps ensure that the airflow remains unobstructed and that contaminants do not accumulate, which would ultimately lead to reduced performance or malfunctions. Keeping the filters clean plays a significant role in maintaining overall air quality; dirty filters can lead to the circulation of harmful pollutants and allergens in the environment. Thus, even if a filter seems clean, it is important to adhere to maintenance schedules to avoid potential issues with system performance and air quality.