What is the function of a filter in an HVAC system?

The function of a filter in an HVAC system is crucial for maintaining indoor air quality. Filters are designed specifically to remove dust, debris, allergens, and other particulates from the air that circulates through the heating, ventilation, and air conditioning system. By capturing these contaminants, the filter helps to ensure that the air being circulated in the building is cleaner and healthier for occupants.

Using efficient filters can also protect the HVAC equipment itself; by preventing dust and debris from entering the system, filters help to minimize wear and tear on components, promote efficient operation, and potentially extend the lifespan of the system. Filters must be regularly maintained and replaced to ensure optimal performance, as a clogged filter can impede airflow and reduce system efficiency.

While filters do contribute to the overall performance of the HVAC system, their primary function is not to increase airflow, regulate temperature, or control humidity levels. Instead, their role is focused primarily on maintaining air purity and quality, making option C the right answer.