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.

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 .

Searching for a ".rar" version of this database often leads to unofficial file-sharing sites. Be aware of the following: Duct Fitting Database - ASHRAE

A more comprehensive mobile version covers all 240+ fittings listed in the ASHRAE Handbook of Fundamentals and allows for project saving and report emailing.

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 (like a .rar), ASHRAE provides several official, secure methods to access this data:

The is a critical tool for HVAC engineers to calculate pressure losses across various duct components. While you may find "rar" files on third-party sites, official access has transitioned away from standalone downloads to cloud-based subscriptions and mobile applications . Official Access Options