Searching for a ".rar" version of this database often leads to unofficial file-sharing sites. Be aware of the following: Duct Fitting Database - ASHRAE
The primary tool is now a web-based platform. Users purchase a one-year subscription to access loss coefficient tables for over 200 round, rectangular, and flat oval fittings. You can manage this through the ASHRAE Bookstore . Download ASHRAE Duct Fitting Database rar
For quick field calculations, ASHRAE offers a free "Lite" version available on the Apple App Store . It includes a subset of common fittings for on-the-go use. Searching for a "