HVAC Static Pressure Calculator

Inputs

View results
Return-side duct and fitting pressure drop at design airflow.
in. w.g.
Clean or design filter pressure drop, not the final dirty-filter limit unless that is your design basis.
in. w.g.
Evaporator coil, hot-water coil, heat exchanger or similar component pressure drop.
in. w.g.
Supply-side duct and fitting pressure drop at design airflow.
in. w.g.
Terminal device, grille, register or diffuser pressure drop.
in. w.g.
Humidifier, damper, silencer, UV rack, economizer or other added pressure drop.
in. w.g.
External static pressure available from the blower table at design airflow.
in. w.g.

Results

Default result
Edit inputs
Total external static(TESP)
0.4818in. w.g.
Pass

within the entered available static pressure

Also computed

Static margin(ESP - TESP)Pass0.02007in. w.g.

remaining blower static after listed losses

Percent of available static(%ESP)96%

Duct-only drop(Δp_duct)0.2409in. w.g.

Filter/coil/accessory drop(Δp_acc)0.2409in. w.g.

Return-side total(Δp_return)0.2007in. w.g.

Supply-side total(Δp_supply)0.281in. w.g.

Method notes 3 notes
  • Total external static pressure is the sum of external pressure drops at the design airflow.
  • Use component pressure drops from manufacturer data at the actual airflow. Filter, coil and grille drops change with flow and loading.
  • Do not add a measured blower-table static value on top of TESP; compare the summed losses to the blower table available static at the target airflow.

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