Duct Fitting Loss Coefficients: flex_duct_90deg_bend
Loss coefficients (C-values) for duct fittings — elbows, tees, transitions, entries and exits per ASHRAE Fundamentals and SMACNA. dP = C * Vp where Vp is velocity pressure.
| fitting type | size or range | C0 (dimensionless) | applicable diameter in (in) | description | geometry notes |
|---|---|---|---|---|---|
| flex_duct_90deg_bend | 8in | 0.95 | 8 | 90-degree bend in flexible duct 8-in diameter | Flexible duct bend loss higher than rigid elbow; minimize bends in flex duct |
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