💨 Blower Flow & Duct System Resistance
Calculate ventilation system resistance and air pressure drops to size industrial blowers and exhaust fans.
Blower Sizing & Static Pressure
To select an industrial blower or ventilation fan, you must plot the system resistance curve. The fan must deliver the design airflow rate (CFM or m³/h) while overcoming the total pressure drop (static pressure) of the ductwork, dampers, hoods, and air filtration units.
Our pipe flow solver supports air as the fluid medium. It calculates major friction losses along galvanized ductwork and minor losses in bends, transitions, and grills using standard dynamic pressure calculations.
💨 Calculate Blower Airflow & Pressure
Launches the solver pre-filled with ventilation air parameters (smooth metal duct, air density at 1 atm, duct diameter, length, and volume flow rate).
Launch Blower Sizing Calculator →Mathematical Formulation
1. Fan Total Pressure ($\Delta P_{total}$)
$$\Delta P_{total} = \Delta P_{static} + P_v$$Where $P_v = \frac{\rho V^2}{2}$ is the velocity pressure, and $\Delta P_{static}$ is the total friction and minor pressure loss in the duct network.
2. Duct Friction Pressure Drop (Darcy-Weisbach)
$$\Delta P_{static} = \left( f \cdot \frac{L}{D} + \sum K \right) \cdot \frac{\rho V^2}{2}$$Where the density of air is typically modeled at $\rho \approx 1.2\text{ kg/m}^3$ at standard conditions ($20^\circ\text{C}$, 1 atm).
3. Blower Air Power ($W_{air}$) and Fan Shaft Power ($W_{shaft}$)
$$W_{air} = Q \cdot \Delta P_{total}$$ $$W_{shaft} = \frac{W_{air}}{\eta_{fan}}$$Where $Q$ is the volume flow rate [m³/s] and $\eta_{fan}$ is the fan mechanical efficiency.