Ashrae Duct Fitting Database 2016 -

The ASHRAE Duct Fitting Database (2016) is available for purchase through the ASHRAE Bookstore as a downloadable package, including:

Summary

Strengths

Limitations

Accuracy and reliability

Practical recommendations

Overall assessment

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Here is the accurate text reference for the ASHRAE Duct Fitting Database (2016).

This database corresponds to the loss coefficients published in the 2016 ASHRAE Handbook—HVAC Systems and Equipment (Chapter 21, Duct Design).

Official Title:

ASHRAE Duct Fitting Database (Version 5.00.00, 2016)

Description:

A computerized database containing pressure loss (loss coefficient "C" or "K") data for several hundred HVAC duct fittings. It is based on the data and methods presented in the 2016 ASHRAE Handbook, replacing prior versions from 2009 and earlier.

Key Details for the 2016 Version:

How to Cite (if using in a report):

ASHRAE. (2016). ASHRAE Duct Fitting Database [Computer software]. Atlanta, GA: ASHRAE.

Note: This database is not free. It was sold by ASHRAE as a paid product (Product Code: 98056). As of 2025–2026, it has been superseded by the ASHRAE Duct Fitting Database (2020) or integrated into tools like ASHRAE Handbook Online and McQuay Duct Sizer.

If you need the actual coefficients, you may also refer to ASHRAE Fundamentals 2017 (Chapter 34) or ASHRAE Fundamentals 2021 (Chapter 33) for the same basic data, though the dedicated 2016 database remains a specific historical version.

To illustrate, let’s design a supply duct with a rectangular 90° mitered elbow without vanes (C1-9). Using the ASHRAE Duct Fitting Database 2016, here is the step-by-step process:

The ASHRAE Duct Fitting Database 2016 is a digital compilation of loss coefficients ((C)) for nearly every conceivable duct fitting used in commercial and residential HVAC systems. It is the digital companion to the printed ASHRAE Handbook—Fundamentals (Chapters 21 and 34) and the ASHRAE Duct Fitting Database—CD (which, in 2016 moved toward more robust digital formats).

Unlike simple friction loss charts (which account for straight duct resistance), this database focuses on dynamic losses caused by: The ASHRAE Duct Fitting Database (2016) is available

The "2016" designation is critical, as it incorporates updated research on Computational Fluid Dynamics (CFD) and empirical testing, superseding previous versions from 2005, 2009, and 2013.

| Edition | Key Features | Limitations | | :--- | :--- | :--- | | 1997 (First CD) | ~200 fittings, basic PDF diagrams | No interactive calculator, no Reynolds correction | | 2005 | Added 50 round/rectangular fittings | Poor flat oval data | | 2013 | First web-enabled version | Clunky interface, no mobile support | | 2016 | 350+ fittings, Re correction, API-ready | No native cloud storage | | 2021 | Cloud-based, BIM integration | Requires subscription; 2016 still widely pirated/used |

For most firms not using full BIM workflows, the ASHRAE Duct Fitting Database 2016 provides the best balance of cost, features, and install-base compatibility.

Problem: Find loss coefficient for a rectangular 90° smooth radius elbow, 24" x 12" duct, centerline radius = 12", no vanes.

A 350-bed hospital in Ohio faced excessive static pressure in its isolation ward supply duct. The original design (1999) assumed mitered elbows with (C=1.5). Engineers re-analyzed using the ASHRAE Duct Fitting Database 2016 and found:

Result: The existing fan was adequate. No new motor was needed, saving $18,000 in equipment and retrofit labor. The 2016 database prevented an unnecessary redesign.