Database 2016 - Ashrae Duct Fitting

The ASHRAE Duct Fitting Database (DFDB) is a comprehensive digital repository of loss coefficients for HVAC duct fittings, based on the extensively referenced ASHRAE Handbook—Fundamentals and the ASHRAE Duct Fitting Database CD originally developed in the 1990s. The 2016 edition represents a significant update, aligning with revised testing methods, modern manufacturing practices, and improved computational tools for system designers.

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). ashrae duct fitting database 2016

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

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. The "2016" designation is critical, as it incorporates

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 2016 DFDB is not freely available – it is copyrighted by ASHRAE.

From the database, for C1-9: (C = 1.2) (based on W/H = 2.0 and no vanes).

The ASHRAE Duct Fitting Database (DFDB) is a comprehensive digital repository of loss coefficients for HVAC duct fittings, based on the extensively referenced ASHRAE Handbook—Fundamentals and the ASHRAE Duct Fitting Database CD originally developed in the 1990s. The 2016 edition represents a significant update, aligning with revised testing methods, modern manufacturing practices, and improved computational tools for system designers.

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 "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.

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 2016 DFDB is not freely available – it is copyrighted by ASHRAE.

From the database, for C1-9: (C = 1.2) (based on W/H = 2.0 and no vanes).