Advanced Static Pressure Calculator

How Static Pressure Calculator Works

Static pressure represents the resistance to airflow inside an HVAC duct system. Proper static pressure calculation is essential for fan selection and efficient airflow distribution.

Components of Static Pressure

Duct friction loss
Air filter pressure drop
Cooling coil resistance
Dampers and control devices
Diffusers and air outlets

Total Static Pressure Formula

Total Static Pressure (TSP) =

Duct Loss + Filter Drop + Coil Drop + Damper Loss + Diffuser Loss

Example

Duct Loss = 0.45 in.wg
Filter Drop = 0.25 in.wg
Coil Drop = 0.35 in.wg
Damper Loss = 0.15 in.wg
Diffuser Loss = 0.10 in.wg

Total Static Pressure ≈ 1.30 in.wg

This value is used for selecting fans, blowers and AHU systems.

Static Pressure Calculator

Duct Friction Loss (in.wg) Filter Pressure Drop (in.wg) Cooling Coil Pressure Drop (in.wg) Damper Pressure Loss (in.wg) Diffuser Pressure Loss (in.wg)

Frequently Asked Questions

1. What is static pressure in HVAC?

Static pressure is the resistance that airflow experiences when moving through ducts, filters and coils in an HVAC system.

2. What is typical static pressure for HVAC systems?

Most residential systems operate between 0.5 to 1.0 inches water gauge (in.wg).

3. Why is static pressure important?

Correct static pressure ensures proper airflow, efficient cooling and correct fan performance.

4. What happens if static pressure is too high?

High static pressure can reduce airflow, increase energy consumption and damage HVAC equipment.