Ashrae Duct Fitting Database Excel ((free)) (2025)

C=C1+(X−X1)(X2−X1)⋅(C2−C1)cap C equals cap C sub 1 plus the fraction with numerator open paren cap X minus cap X sub 1 close paren and denominator open paren cap X sub 2 minus cap X sub 1 close paren end-fraction center dot open paren cap C sub 2 minus cap C sub 1 close paren

An Excel calculation sheet displays the logic clearly:

Cloud access ensures data is always current with the latest ASHRAE research.

: Both the full ASHRAE Duct Fitting Database web version and the mobile apps allow you to email reports that include spreadsheet attachments . These can be opened in Microsoft Excel for further system-wide analysis.

Enter dimensions, airflow (CFM), and material roughness into the database to get the specific loss coefficient or pressure loss. ashrae duct fitting database excel

: Locate the specific fitting (round, rectangular, or flat oval) and retrieve its pictorial outline and loss coefficient.

: Systematically number or tag every fitting and straight duct section along that path. Retrieve Loss Values

With coefficient C , velocity pressure Pv (in inches w.g. or Pa), the loss is:

: Includes visual outlines for each fitting, ensuring engineers select the correct geometry for their specific design. Enter dimensions, airflow (CFM), and material roughness into

There are two ways this is typically achieved:

No need to switch between software applications. Creating an ASHRAE Duct Fitting Database in Excel

You can acquire the standalone ASHRAE Duct Fitting Database application, which features an interactive interface and printable reports.

Essentially, it is the lookup table on steroids, ready for formula-driven analysis. Retrieve Loss Values With coefficient C , velocity

For the HVAC engineer, the benefits are clear: reduced manual lookup time, elimination of interpolation errors, standardized reporting, and full integration with existing Excel‑based design workflows. The key is to understand the available access methods, respect ASHRAE’s intellectual property, and build systems that leverage the database’s power while maintaining the flexibility that only a spreadsheet can provide.

ASHRAE sells a standalone desktop application. Many workflows involve using the app to look up specific, complex fitting coefficients and manually pasting those values into an Excel master static pressure profile sheet.

If you want to automate your workflow, you can create a custom Excel sheet that mirrors the ASHRAE methodology. Define the Critical Path

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