What is the primary purpose of filters in a forced warm air system?

The primary purpose of filters in a forced warm air system is to clean the air. This function is crucial because the filters trap dust, allergens, and other particulate matter that can accumulate in the air as it circulates through the heating system. By removing these contaminants, filters help maintain indoor air quality and ensure that the air being heated and distributed throughout the space is cleaner and healthier for occupants.

Clean air is essential for the comfort and well-being of individuals, particularly those who may suffer from allergies or respiratory conditions. Additionally, filters can help protect the system's components by preventing dirt and debris from accumulating within the heating system itself, potentially leading to more efficient operation and reducing maintenance issues over time.

While options like increasing air pressure, reducing heating costs, or regulating temperature can be relevant in various contexts within heating systems, they are not the primary function of filters. Filters mainly focus on the air cleanliness aspect, which is vital for both health and maintaining system efficiency.