What is the primary function of a furnace air filter?

The primary function of a furnace air filter is to trap dust and allergens from the air. This is essential for maintaining indoor air quality, as the filter captures particulate matter, such as dust, pollen, pet dander, and other allergens that can circulate through the heating system. By doing so, it helps to reduce the amount of these particles in the air that occupants breathe, which is particularly important for individuals with respiratory issues or allergies.

Additionally, by filtering out these contaminants, the air filter contributes to the efficiency and longevity of the HVAC system. A clean filter allows for proper airflow, preventing strain on the furnace and helping to maintain consistent temperature control throughout the living space. Therefore, the role of trapping dust and allergens is crucial not just for health reasons, but also for the effective functioning of the heating system.