Your duct system—and your building owner's utility bill—will thank you.
Do you need an example of a (e.g., a rectangular elbow with vanes)?
While ASHRAE continuously updates its data, version 6.00.05 represents a refined, stable iteration designed for accuracy and user experience. ashrae duct fitting database version 60005
Using Version 6.00.05 effectively requires an understanding of how ASHRAE classifies supply, return, and exhaust configurations.
While straight duct pressure drops are easily calculated using the Darcy-Weisbach equation or the ASHRAE friction chart, fittings—such as elbows, tees, transitions, and hoods—introduce complex turbulence and dynamic pressure losses. Using Version 6
The ASHRAE Duct Fitting Database (DFDB) is a cornerstone software tool for mechanical, electrical, and plumbing (MEP) engineers, HVAC designers, and energy auditors worldwide. Accurate duct design is critical not just for thermal comfort, but also for minimizing fan energy consumption and building operating costs. Version 6.00.05 represents a stable, highly relied-upon iteration of this database, delivering precise loss coefficient data for a vast array of duct fittings.
When air flows through a straight piece of ductwork, it experiences friction loss. However, when it encounters a fitting—such as an elbow, tee, transition, or hood—the air changes direction or velocity, creating turbulent eddies. This disruption causes dynamic pressure loss. Accurate duct design is critical not just for
| Software | Supports Version 60005? | Notes | | :--- | :--- | :--- | | | ✅ Full | Requires Fabrication 2024 Config | | CADduct 2023+ | ✅ Full | Native integration | | Trane Duct Designer | ⚠️ Partial | Manual import required | | McQuay Duct Sizer (Free) | ❌ No | Stuck on version 3.0 | | Carrier HAP (v6.2) | ⚠️ Partial | Uses 60005 for fittings; fans use older data |
) for the fitting is computed by multiplying the velocity pressure by the ASHRAE-defined dimensionless loss coefficient ( Cocap C sub o Δp=Co×Pvdelta p equals cap C sub o cross cap P sub v Version 6.00.05 looks up the precise Cocap C sub o