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Duct Fitting Loss Coefficients: transition fan outlet rect to round
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 |
|---|---|---|---|---|---|
| transition fan outlet rect to round | all | 0.16 | SD4-2 | SD4-2 Fan outlet rectangular-to-round transition; 260x310mm outlet to round duct; L=460mm | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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