What does an HVAC system typically filter from indoor air?

An HVAC system typically filters dust and allergens from indoor air as part of its primary function to maintain air quality. The air filtration process is critical in reducing the concentration of airborne particles, such as dust, pollen, pet dander, and other allergens, which can negatively affect health, especially for individuals with allergies or respiratory issues.

Filters used in HVAC systems are designed with varying levels of efficiency to capture these smaller particles effectively while allowing clean air to circulate throughout the building. By removing these contaminants from the air, HVAC systems help create a healthier indoor environment, improving overall comfort and well-being for occupants.

In contrast, options involving excess heat, noise pollution, and vibrations do not align with the core filtering functionality of HVAC systems, as these elements are managed through other design considerations or system components rather than filtration.