Ashrae Duct Fitting Database — Version. 6.00.05

The ASHRAE DFDB is a specialized software application containing loss coefficients for hundreds of duct fittings. It covers a vast range of geometries, including elbows, transitions, tees, junctions, and hoods.

Automatically adjusts calculations based on Reynolds numbers and velocity pressures.

: It supports both I-P (Imperial) and SI (Metric) units, allowing for global project applicability. ashrae duct fitting database version. 6.00.05

: Accurately determine the pressure needed to overcome resistance from elbows, transitions, and straight sections to properly size fans and AHUs. Ensure Compliance : Align your designs with the 2021 ASHRAE Handbook of Fundamentals Optimize Real-Time

= The localized dimensionless loss coefficient retrieved from the database. Pvcap P sub v = Velocity pressure of the air stream, calculated as: The ASHRAE DFDB is a specialized software application

Understanding the ASHRAE Duct Fitting Database Version 6.00.05

Understanding the ASHRAE Duct Fitting Database (DFDB) Version 6.00.05 : It supports both I-P (Imperial) and SI

One common source of error is using the wrong velocity pressure (upstream vs. downstream). Version 6.00.05 explicitly labels whether the loss coefficient is based on:

If your projects are small residential systems with simple round ducts, you may not need the full database—but the viewer is still faster than flipping pages.