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Duct Fitting Loss Coefficients: wye capped 45 with 45elbow
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 capped 45 with 45elbow | all | 0.61 | ED5-6 | ED5-6 Capped wye 45-degree with 45-degree elbow; Ab/Ac=1; C branch referenced to branch Vp | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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