Duct Fitting Loss Coefficients: tee_branch_90
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 |
|---|---|---|---|---|
| tee_branch_90 | all | 0.9 | Tee fitting - 90-degree branch takeoff from main duct | Right-angle branch from round main; C referenced to branch velocity pressure |
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