Rather than downloading a potentially unsafe compressed file (like a .rar), ASHRAE provides several official, secure methods to access this data:
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
Older database versions (like 5.0) are sometimes integrated directly into design software like Autodesk Revit to help MEP engineers calculate pressure loss during the design process. Risks of Third-Party ".rar" Downloads Rather than downloading a potentially unsafe compressed file
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. ASHRAE provides several official