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Duct Fitting Loss Coefficients: wye 30 branch ed5 1
Loss coefficients (C-values) for duct fittings — elbows, tees, wyes, transitions, entries, exits, and specialty fittings per ASHRAE Fundamentals and SMACNA. dP = C * Vp where Vp is velocity pressure at the referenced duct cross-section.
| fitting type | size or range | C0 (dimensionless) | ashrae code | geometry notes | standard |
|---|---|---|---|---|---|
| wye 30 branch ed5 1 | all | 0.21 | ED5-1 | ED5-1 Wye 30-degree branch; Qb/Qc=0.40 As/Ac=0.510 Ab/Ac=0.413; C branch referenced to branch Vp; value is geometry-dependent | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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