Duct Fitting Loss Coefficients: tee_90_plain_sd5_9
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 |
|---|---|---|---|---|---|
| tee_90_plain_sd5_9 | branch | 1.8 | SD5-9 | SD5-9 Plain 90-degree tee (lowest efficiency tee); C_branch referenced to branch Vp | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
| tee_90_plain_sd5_9 | main | 0.15 | SD5-9 | SD5-9 Plain 90-degree tee (lowest efficiency tee); C_main | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
This is a sample. Search the full duct fitting loss coefficients dataset and 350+ more by creating a free account and accessing the database.
Get started for FREERelated data
damper_butterfly_50pct_open1 rowdamper_butterfly_fully_open1 rowelbow_45_smooth_r1.01 rowelbow_45_smooth_r1.51 rowelbow_60_3gore_r1.51 rowelbow_90_3gore_r1.51 rowelbow_90_7gore_r2.51 rowelbow_90_mitered_double_vane1 rowelbow_90_mitered_single_vane1 rowelbow_90_mitered_unvaned1 rowelbow_90_rect_smooth_r1.01 rowelbow_90_rect_smooth_r1.51 row