Before opening Excel, you need the pressure drop (in inches of water gauge — in. w.g. or Pascals) for each component:
Changing a duct size or adding an elbow updates the total ESP instantly. esp calculation hvac excel sheet
A hospital RTU delivers 8,000 CFM instead of 10,000 CFM. The maintenance team replaced filters but no improvement. Before opening Excel, you need the pressure drop
He linked every cell. No hard numbers. If he changed the airflow from 25,000 to 22,000, everything recalculated instantly. Before opening Excel
: Section number, duct width/diameter, height, and length. Airflow Data : Volumetric flow rate (CFM or ) and air velocity (