The ASHRAE Duct Fitting Database (DFDB) is recognized globally as the industry-standard reference for calculating pressure losses in HVAC duct systems. Specifically, Version 6.00.05 represents a significant iteration of this essential software tool, providing engineers, designers, and contractors with the data necessary to model airflow systems with high precision.
Developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), this database is the digital companion to the fitting loss coefficients found in the ASHRAE Handbook—Fundamentals. It moves beyond static tables, offering dynamic calculation capabilities that streamline the HVAC design process. ashrae duct fitting database version. 6.00.05
By 2021, version 6.00.05 had been integrated into the ASHRAE Handbook Online, and its fitting definitions became the basis for digital twins of building systems. Energy modeling software like EnergyPlus and IES-VE began referencing it directly. When the next version (7.0) was released in 2023, it built on the foundation of 6.00.05 — but veteran engineers still kept a copy of the 6.00.05 .accdb file on their servers. The ASHRAE Duct Fitting Database: An Overview of Version 6
Why? Because 6.00.05 was the first version where the uncertainty bounds for each coefficient were published alongside the values. That transparency allowed engineers to run probabilistic pressure drop simulations — something unthinkable with older paper tables. It moves beyond static tables, offering dynamic calculation
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