The ASHRAE Duct Fitting Database (DFDB) version 6.00.05 is a paid, cloud-based subscription product, though a free "Lite" version is available for mobile devices. The full version provides comprehensive, real-time pressure loss calculations for over 200 fittings, while the free app offers a limited subset of data. To purchase the full software, visit Duct Fitting Database - ASHRAE
Input Parameters: Enter the duct dimensions (Width, Height, or Diameter) and the airflow velocity. Calculate Loss: The software provides the value. You then use the standard pressure loss formula: ashrae duct fitting database 6.00 05 free download
While version 6.00.05 is excellent, you should know about its successors: The ASHRAE Duct Fitting Database (DFDB) version 6
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