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The speed of the air (FPM or m/s), which directly affects friction.
Helps ensure that the total pressure does not exceed the capacity of the air handling unit (AHU).
The diameter (round) or height and width (rectangular) of the duct.
By accurately sizing fans, you prevent over-pressurizing the system, which wastes energy.
I can help walk you through the calculation or direct you to a specific tool. Duct Pressure Loss Calculator | Plastec Ventilation
you are calculating (e.g., radius elbow, mitered bend, reducer)? What is your airflow rate (CFM) and duct size ?