SPECIFICATION SHEET • SI METRIC
CAT: HVAC
Fan Power from Airflow & Static Pressure
Estimate fan shaft input power from airflow, static pressure, and fan efficiency.
💡 Engineering Knowledge PrimerFan input power is the product of air volume flow and total pressure divided by fan/drive efficiency. This is a duty-point estimate, not a fan-curve selection or motor-starting study.
OPERATING LIMITS — Fan duty-point power estimate only; verify fan curves, total versus static pressure, system effect, motor selection, controls, and starting current.
INPUT DESIGN PARAMETERS (SI)
m³/h
Pa
%
CALCULATED SPECIFICATION OUTPUT
Estimated Input Power
3.17 kW
| Air Power | 2.22 kW |
Related planning checklists
This calculator appears in the following engineering planning checklists:
HVAC Airflow, Duct & Fan Sizing Check
HVAC Engineer1. Factory Air Exchange & Ventilation2. Duct Diameter from Airflow & Velocity3. Fan Power from Airflow & Static Pressure4. Airflow Sensible Cooling Load
Technical Methodology & Engineering Principles
GOVERNING EQUATION
Air Power (kW) = Q (m³/s) × ΔP (Pa) / 1000
Input Power = Air Power / Fan Efficiency
Assumptions & Scope
Steady airflow and total pressure at the fan duty point; efficiency includes fan and drive losses.
Operating Range & Boundary
Airflow, pressure, and efficiency must be positive; efficiency cannot exceed 100%.