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Fan Law 2: Static Pressure and CFM Relationship

Fan Law 2 dives into the dynamics between airflow, quantified as Cubic Feet per Minute (CFM), and the resulting static pressure within a system. This law illustrates that the total static pressure varies with the square of the airflow or RPM, signifying that small increases in CFM can cause disproportionately larger increases in static pressure. Understanding this relationship is crucial for designing and maintaining efficient HVAC systems.


Fan Law 2 Static Pressure and CFM Relationship Insight Partners

Fan Law 2: Static Pressure and CFM Relationship


Law: Total Static Pressure changes with the square of CFM (or RPM).


Formula: SP2 = SP1 × (CFM2 ÷ CFM1)²


Practical Meaning: A slight increase in airflow (CFM) leads to a disproportionately larger increase in static pressure. A 10% increase in CFM results in a 21% increase in static pressure.


Field Application: When increasing airflow, it's crucial to consider the impact on static pressure across system components. For instance, increasing airflow from 1000 CFM to 1200 CFM can significantly increase the pressure drop across a filter, affecting its efficiency.



The practical implications of Fan Law 2 are vital for HVAC system design and maintenance. As airflow is adjusted, recognizing the impact on static pressure helps prevent unintended consequences such as reduced system efficiency or component strain. This law provides essential insights for technicians and engineers to ensure that airflow adjustments yield the desired outcomes without compromising system integrity.


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