Fan System Pressure Loss Calculator
Total system pressure loss a fan must overcome across components.
Enter your values
ⓘ Live results
Results
- Total system static pressure
- 1.6 in wc
- Select fan at (+15% margin)
- 1.84 in wc
- Largest contributor
- duct
Quick answer
Total fan system pressure loss is the sum of the pressure drops across every filter, coil, duct run, fitting and accessory in the airstream.
SP_total = sum of all component pressure drops
How to use the Fan System Pressure Loss Calculator
- 1List the pressure drop across each component in the airstream: filters, coils, duct friction, fittings and any accessories.
- 2Sum them to get total system static pressure.
- 3Select the fan at this total plus a design margin, typically 10-15%.
Worked example
Using the values the calculator loads with:
Inputs
- Filter loss0.4 in wc
- Coil loss0.3 in wc
- Duct friction loss0.5 in wc
- Fittings loss0.25 in wc
- Other accessories loss0.15 in wc
Results
- Total system static pressure1.6 in wc
- Select fan at (+15% margin)1.84 in wc
- Largest contributorduct
Frequently asked questions
Should I include filter loss at 'dirty' or 'clean' condition?
Design at a mid-to-dirty loading so the fan still delivers enough airflow as the filter loads up.
What if I'm missing a component?
Add its individual pressure drop from a duct pressure drop or fitting calculator and include it in the total.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.