Ashrae Duct Fitting Database 2016 ((top)) Now

ASHRAE Duct Fitting Database (DFDB) , specifically Version 6.00.05 released in April 2016

Note: ASHRAE released a cloud-based API for the database in 2018, but the core 2016 dataset remains the reference standard for most BIM and Revit families. ashrae duct fitting database 2016

• Added rectangular mitred elbows with turning vanes (multiple vane types).
• Added flat-oval fittings (elbows, tees, transitions) – previously only round/rectangular.
• Added 45° round lateral taps and conical tees.
• Corrected errors in several round tap fittings from v4.0.
• Improved accuracy for rectangular 90° elbows with splitter vanes.
• Updated documentation with new test data from Texas A&M University and University of Illinois.

The database allows users to select specific duct components and input design parameters—such as airflow (CFM), dimensions, and density—to automatically generate: Loss Coefficients ( ASHRAE Duct Fitting Database (DFDB) , specifically Version 6

For current projects, use ASHRAE DFDB v6.0 (2020) if possible, but many legacy systems still reference the 2016 coefficients. Always verify the fitting number and reference velocity definition when extracting $C$ values. Added rectangular mitred elbows with turning vanes (multiple