It allows for variable air densities, temperatures, and duct surface roughness.
18;write_to_target_document7;default0;b82;18;write_to_target_document1a;_AynuafWFFf7eseMPlZDIoAw_20;92;0;a1; 0;baf;0;63a; Core Technical Functionality 0;16; ashrae duct fitting database pdf patched
Older versions of the database sometimes struggle with modern operating systems (like Windows 11). A "patched" version might be sought to solve compatibility issues. It allows for variable air densities, temperatures, and