Sample data from Engineering Database — 375 reference tables, deterministic calculators, and Engineering AI. Sign up free
Duct Fitting Loss Coefficients: wye 45 conical tapered sd5 2
branch to main
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 45 conical tapered sd5 2 | branch | 0.45 | SD5-2 | SD5-2 Wye 45-degree conical branch tapered into body (highest efficiency wye); C branch | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
| wye 45 conical tapered sd5 2 | main | 0.15 | SD5-2 | SD5-2 Wye 45-degree conical branch tapered into body (highest efficiency wye); C main | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
What else is in Engineering Database
Iron Engine ↗Engineering AI at ironengine.ai
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculatorsCalculators that use this data
Related 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