Warning: Avoid "free" download sites claiming to offer the full database—many contain outdated 1997 data or malware.
: The 2016 version is frequently cited in professional manuals (like the Duct Systems Design Guide ashrae duct fitting database 2016
Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. ASHRAE Duct Fitting Database Lite App - ASHRAE Warning: Avoid "free" download sites claiming to offer
ASHRAE Duct Fitting Database (DFDB) is a critical tool for HVAC design engineers, providing the precise data needed to calculate pressure losses within air distribution systems. By the time of the 2016 updates, the database had established itself as an industry standard for ensuring system efficiency and proper fan sizing. Precision in HVAC Design ashrae duct fitting database 2016