The database is based on rigorous laboratory testing methods outlined in , Method of Testing to Determine Flow Resistance of HVAC Ducts and Fittings . This standard ensures that all loss coefficients are derived from uniform, repeatable, and scientifically valid procedures, providing engineers with confidence in their calculations.
Through plugins like Stabicad or Fabrication CADmep , you can map the DFDB version 6.00.05 coefficients directly to your ductwork model. The API typically requires you to point to the .mdb file path. Revit’s "Mechanical Settings" → "Duct Fitting Pressure Drop" can reference the database if an appropriate dynamo script or add-in is used.
What used to take 15 minutes of manual lookups per fitting takes under 30 seconds within the application interface. ashrae duct fitting database version. 6.00.05
The client's energy consultant challenged her pressure drop calculations for a duct transition in the mechanical room. In the past, Maria would have printed out PDFs, highlighted rows, and argued over interpolation. Now, she exported the fitting's data card — a clean table showing loss coefficients at eight different velocity points, with a note about the database version and revision date.
= The localized dimensionless loss coefficient retrieved from the database. Pvcap P sub v = Velocity pressure of the air stream, calculated as: The database is based on rigorous laboratory testing
The solution was a — a structured collection of fitting definitions, each with a unique identifier (like "EL-1-1" for a smooth radius elbow) and a set of loss coefficient equations as a function of velocity pressure or Reynolds number.
The database's methodology is grounded in ASHRAE Standard 120, which establishes uniform laboratory testing methods for determining airflow resistance. The API typically requires you to point to the
The software computes pressure losses by using localized loss coefficients ( Cocap C sub o
Then automatically calculate pressure drops for entire duct networks.
Required to view native PDF fitting diagrams embedded within the software help files.