Duct Fitting Loss Coefficients: entry_duct_bellmouth
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_bellmouth | all | 0.04 | Bell-mouth duct entry from large plenum | Well-designed bell-mouth nearly eliminates entry loss |
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