Ashrae Duct Fitting Database 6.00 05 Free Download May 2026

Before we dive into the specifics of version 6.00.05, it is vital to understand what this software actually is. The ASHRAE Duct Fitting Database is a digital implementation of the data found in the ASHRAE Fundamentals Handbook (Chapter 34, "Duct Design") and the ASHRAE Duct Fitting Database (DFDB) technical standard.

Historically, engineers had to manually look up "Dynamic Loss Coefficients" (C or Co) using printed tables and complex interpolation. The database changed the game by offering:

Version 6.00.05 represents a mature, stable release that includes all corrections and errata up to its publication date, making it one of the most trusted versions for legacy projects. ashrae duct fitting database 6.00 05 free download

Because version 6.00.05 is an older build, many firms have upgraded to newer versions and are legally allowed to sell their old physical license keys (dongles). Check eBay, Craigslist, or HVAC engineering forums. Look for the original CD-ROM and the USB hardware key. Crucial note: Ensure the seller transfers the license registration officially to avoid "blacklisting."

If you cannot afford a full new license, do not resort to piracy. Here are legitimate pathways to access version 6.00.05 at a reduced or free cost. Before we dive into the specifics of version 6

ASHRAE periodically updates this software.

Problem: You have a 24" x 12" rectangular main duct. A 12" x 8" rectangular branch takes off at 45 degrees. You need the pressure loss for fan sizing. Version 6

Solution using DB 6.00.05:

  • Click "Calc." The software outputs:

    • You then add this to your duct traverse spreadsheet. Without the database, you would have guessed or used an outdated table, risking under-sizing your fan.

    The ASHRAE Duct Fitting Database is a digital repository that codifies the loss coefficients (often denoted as "C" or "C") for thousands of duct fittings. It is the digital companion to the ASHRAE Handbook—specifically the 2009, 2013, 2017, and 2021 ASHRAE Handbook—Fundamentals, Chapter 34 (Duct Design).

    Before this database, engineers spent hours manually interpolating charts and tables. The database automates this, allowing users to: