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How Dirty Filters Change Airflow, Fan Power and Cooling Capacity

Air filters are small components compared with AHUs, FCUs, package units, and duct systems, but their effect on HVAC performance is very large. A clean filter protects the cooling coil, fan, ductwork, and indoor air quality. A dirty filter, however, becomes an airflow restriction.


When filters are not cleaned or replaced on time, the HVAC system may still run, but it will no longer operate at its designed condition. Airflow reduces, fan pressure increases, cooling capacity drops, energy consumption changes, and comfort complaints begin.


Dirty filters are one of the most common causes of poor cooling, low air volume, high humidity, coil freezing, fan overload, and increased operating cost. (How Dirty Filters Change Airflow Fan Power and Cooling Capacity)

Dirty Filters Reduce HVAC Performance

Download the full design guide PDF with detailed calculations, sizing, code compliance, and real project insights.  (How Dirty Filters Change Airflow Fan Power and Cooling Capacity)



For detailed calculations, project-specific design, and authority-compliant solutions, contact our engineering team.

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