Below is a concise, structured report covering the ASHRAE Duct Fitting Database version 6.00.05: what it contains, key changes/notes, compatibility, data format, typical use cases, validation and quality guidance, and recommended next steps.
Engineers utilize the DFDB data in conjunction with standard design methods to ensure efficient fan selection and system performance: ashrae duct fitting database version. 6.00.05
Note: Beware of “free downloads” online—they often contain corrupted files or earlier version (v4.0) with outdated coefficients. ASHRAE Duct Fitting Database — Version 6
ASHRAE's response was swift: an Errata Sheet for 6.00.05 (released June 2019) clarifying that the penalties were optional for preliminary design but mandatory for LEED energy models. That nuance became a debate topic at the 2020 ASHRAE Winter Conference in Orlando — a sign that the database had become a living document, not a dusty reference. Diameter (in or mm): 12 inches Radius/Diameter ratio
Key Features of Version 6.00.05
Fitting Library: Includes detailed tables and pictorial outlines for more than 200 to 240+ round, rectangular, and flat oval fittings.