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Static Pressure Calculator

Calculate total external static pressure (ESP) by adding component pressure drops.

Supply Side Components

Return Side Components

Additional Components

UV lights, humidifier, etc.

Typical Component Pressure Drops

ComponentPressure Drop
Duct (per 100 ft equiv)0.08-0.12 in wg
90 Elbow0.02-0.04 in wg
Tee Branch0.03-0.06 in wg
Supply Diffuser0.02-0.05 in wg
Return Grille0.02-0.04 in wg
Cooling Coil (wet)0.15-0.30 in wg

Design Guidelines

Residential: 0.30-0.50 in wg typical ESP

Commercial: 0.50-1.50 in wg typical ESP

Dirty Filter: Can add 0.20-0.50 in wg to clean filter drop!