Many official ASHRAE Excel files include custom VBA functions like InterpolateCoefficient(FittingID, param1, param2) .
Step 1 — Get and inspect the data
), which is vital for proper fan sizing and system balancing. How to Access the "Excel Link"
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 ashrae duct fitting database excel link
Each fitting has a unique (e.g., "E1-1" for a 90° smooth elbow) and its loss coefficient depends on geometry ratios (e.g., r/D , W/H , angle, area ratios). The official data is maintained by ASHRAE Technical Committee (TC) 5.2 .
This method gives you a live link to the official database—no manual copying.
If you don't have a live subscription, you can still build a link-ready sheet: Many official ASHRAE Excel files include custom VBA
Velocity Pressure (Vp)=(Velocity in FPM4005)2Velocity Pressure open paren cap V sub p close paren equals open paren the fraction with numerator Velocity in FPM and denominator 4005 end-fraction close paren squared
The official DFDB is now primarily cloud-based, but it offers reporting features that bridge the gap to Excel:
A Duct Fitting Database Lite app is available for iPhone/iPad. 2. Community and Third-Party Excel Links Building Your Own ASHRAE Duct Fitting Calculator in
Finding a direct, functional "Excel link" for this database requires understanding how ASHRAE distributes the data and how you can integrate it into your spreadsheets. What is the ASHRAE Duct Fitting Database?
The ASHRAE Duct Fitting Database is a collection of loss coefficients (C-factor, or technically Co for round and Co' for rectangular) for hundreds of HVAC fittings, including:
Enforce strict naming conventions (e.g., "SD4-1", "CD3-5") in your spreadsheets so your lookup formulas never break.
Author’s Note: Always respect intellectual property. The ASHRAE Duct Fitting Database is the result of decades of costly research. Using a legitimate copy ensures you have the correct coefficients and supports ongoing industry research.
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