Duct Fitting Loss Coefficients: elbow_90_3gore_r1.5
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 |
|---|---|---|---|---|---|
| elbow_90_3gore_r1.5 | all | 0.34 | CD3-12 | CD3-12 Round duct 90-degree 3-gore elbow r/D=1.5; moderate loss gored construction | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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