This article explores everything you need to know about ASHRAE Duct Fitting Database Version 6.00.05: its features, technical improvements, how to use it, and why it remains the gold standard for HVAC system modeling.

The database includes a diagram for each fitting ID. Do not guess by name alone. A "45° wye" can have throat radius, branch angle, and heel radius variations.

New entries for straight round ducts (constant equal friction and velocity limited) and flexible elbows with specific radius ratios (r/D=1.0 and 1.5). Enhanced Input Ranges:

This software eliminates the need for manual interpolation of complex charts. By inputting specific parameters such as air velocity, duct dimensions, and construction material, the software calculates:

SELECT FittingType, LossCoeff, RefVelocityID FROM tbl_fittings WHERE FittingID = 'RE1-5';

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