What is the purpose of a pre-filter in an HVAC system?

The purpose of a pre-filter in an HVAC system is primarily to extend the life of the primary filter. By capturing larger particles such as dust, debris, and other contaminants before they reach the primary filter, the pre-filter reduces the load on the primary filtering system. This not only enhances the efficiency of the air filtration process but also prolongs the operational lifespan of the primary filter, allowing it to perform effectively for a longer duration before requiring replacement. This maintenance aspect is crucial for ensuring that the HVAC system runs efficiently, helps maintain good air quality, and reduces overall maintenance costs.

While the pre-filter can indirectly contribute to air quality improvement and system performance by minimizing the amount of debris that reaches the primary filters, its main function is focused on protection and longevity of those primary filters rather than directly impacting moisture control or increasing system pressure.