Excel Link: Ashrae Duct Fitting Database

Create a data tab in your Excel file that maps the "Fitting Code" to its corresponding C-factor (often a function of radius ratio or velocity). Use =VLOOKUP or =INDEX(MATCH()) to bring these values into your main calculator. Key Benefits of Using the DFDB in Excel

For engineers who prefer to build their own Excel models, loss coefficient data can be manually extracted from the DFDB. By selecting a fitting, choosing "Preview Tbl" from the File menu, users can view the underlying data tables and manually transfer them into Excel for custom calculations. However, this approach is time-consuming and not recommended for routine use.

The standalone desktop version of the ASHRAE Duct Fitting Database includes built-in utility features designed to communicate with external spreadsheets.

The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) provides a comprehensive duct fitting database in Excel format, which is a valuable resource for engineers, designers, and contractors working on HVAC systems. The database contains a wide range of duct fittings, including elbows, tees, wyes, and reducers, among others. ashrae duct fitting database excel link

The is a digital catalog of over 200 different round, rectangular, and flat oval duct fittings. For each fitting, the DFDB provides the published loss coefficients (K-values) needed to calculate the pressure drop in an HVAC system.

The following tools provide the standardized loss coefficient data you need: Cloud-Based Subscription : The most up-to-date version is the ASHRAE Duct Fitting Database , accessible via an annual subscription. Mobile App (DFDB Lite) : A free version available on the Apple App Store

: Both the web-based version and the mobile app feature a "Reports" option. You can select "Inputs and Results" to generate an HTML email that includes a spreadsheet attachment compatible with Microsoft Excel. Third-Party Excel Tools : Sites like Create a data tab in your Excel file

The database provides loss coefficient tables for over , covering round, rectangular, and flat oval designs.

: Export duct schedules directly to Excel using Revit’s internal ASHRAE fitting calculation engine.

However, there are several ways to work with this data in Excel: 1. Official Mobile App (Lite Version) By selecting a fitting, choosing "Preview Tbl" from

Searching platforms like Eng-Tips HVAC Forum often yields user-created Excel tools that replicate specific sections of the DFDB, such as elbows, tees, or transitions. Building Your Own ASHRAE Duct Fitting Calculator in Excel

pv=(Velocity4005)2 (IP units)p sub v equals open paren the fraction with numerator Velocity and denominator 4005 end-fraction close paren squared (IP units)

dll = ctypes.CDLL("C:/ASHRAE/ASHRAEDFDB.dll") dll.GetFittingData.argtypes = [c_long, c_double, c_double, c_double, ctypes.POINTER(c_double)]

When air moves through a straight duct, it experiences friction loss. When it encounters a fitting—such as an elbow, tee, transition, or obstruction—the air suffers dynamic pressure losses due to turbulence, flow separation, and changes in velocity or direction. The total pressure loss ( Pjcap P sub j ) for a specific fitting is calculated using the formula: Pj=Co×Pvcap P sub j equals cap C sub o cross cap P sub v Pjcap P sub j = Total pressure loss (in. wg or Pa) Cocap C sub o = Fitting loss coefficient (dimensionless) Pvcap P sub v