What is a common characteristic of air filters in HVAC systems?

Air filters in HVAC systems play a crucial role in maintaining indoor air quality. They are designed to capture and remove pollutants such as dust, pollen, pet dander, mold spores, and other airborne particles from the air circulating through the system. By doing so, filters help ensure that the air you breathe indoors is cleaner and healthier, which is especially important for individuals with allergies or respiratory issues.

This characteristic highlights the importance of regular filter maintenance and replacement, ensuring that the HVAC system operates efficiently while providing optimal air quality. Effective filtration can reduce contaminants inside homes and buildings, contributing significantly to overall comfort and health.

The other characteristics mentioned do not accurately describe the primary function of air filters in HVAC systems. For instance, air filters are not interchangeable with heat exchangers, as they serve different purposes in the system. They do not primarily increase humidity levels, which is a function of humidifiers, and air filters are typically located within the system, not outside.