ASHRAE Duct Fitting Database (DFDB) Version 6.00.05 is a specialized tool for HVAC engineers to calculate pressure loss across more than 200 types of duct fittings. While the full version is a paid subscription

If you can’t access an official download

. It allows pressure loss calculations for 14 select ASHRAE duct fittings. Full Version 6.0 (Paid Subscription):

  1. Purchase the software from the ASHRAE website.
  2. You will receive a download link and a valid License Key.
  3. Download the installation package (usually a .exe or .zip file).
  4. Run the installer and follow the on-screen prompts.
  5. When prompted, enter your license key to activate the full database.

The official software is currently a cloud-based subscription service. Below is a review of the features, official access methods, and free alternatives. Core Features & Functionality