Duct Fitting Loss Coefficients: entry_duct_flush
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) | description | geometry notes |
|---|---|---|---|---|
| entry_duct_flush | all | 0.85 | Duct entry flush with plenum or AHU casing wall (re-entrant) | Worst case entry with no bell-mouth or rounding |
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