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Home / Calculators / Equal Friction Duct Static Pressure Loss Solver
Airflow & Psychrometrics โœ“ ISO/ASHRAE Thermodynamic Math โ€ข Calibrated for 42ยฐC Tropical Ambient

Equal Friction Duct Static Pressure Loss Solver

Solve duct external static pressure loss, equivalent length, air velocity, and fan brake horsepower (BHP) for commercial ductwork in Pune.

โšก Live Interactive Computation Engine โœ“ Real-Time Field Calibrated
Avg 25 ft equivalent length per 90ยฐ elbow
Total External Static Pressure (ESP)
0.35 in. WG (87.2 Pa)
Air Velocity: 1,080 FPM (Low Noise Commercial)
Total Equiv. Length: 220 ft Friction Rate: 0.16 in. WG / 100ft Fan Static BHP: 0.28 HP
SMACNA HVAC Duct Construction Standards: Maintain velocity <1,200 FPM in occupied office spaces.
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Governing Formula:
ฮ”P_friction = f ร— (L_straight + ฮฃL_fittings) / D_h ร— (ฯ ร— Vยฒ / 2); ESP = Friction Drop + Component Static Drops
Pune Field Notes & Environmental Standards:

Calculates external static pressure (ESP) for AHUs and fan coil units in accordance with SMACNA HVAC Duct Construction Standards.

Technical Engineering Guide & Field Diagnostic Practices

Static pressure drop across supply and return duct runs is the primary factor dictating blower motor sizing and acoustic performance. Excessive static friction causes fan motor overloading, airflow starvation at terminal diffusers, and air whistling noise. This solver utilizes the Darcy-Weisbach and Colebrook-White formulations to determine total external static pressure (ESP in. WG and Pascals), equivalent duct lengths, and required fan brake horsepower (BHP).

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