Excel - Ashrae Duct Fitting Database

Excel can link duct sizing calculation sheets directly to fitting loss coefficients, eliminating manual data entry.

In the world of Heating, Ventilation, and Air Conditioning (HVAC), precision is not just a luxury; it is a necessity. Every elbow, transition, tee, and damper in a duct system adds resistance that a fan must overcome. For decades, engineers have relied on the —specifically Chapter 34, "Duct Design"—to find loss coefficients for these fittings.

However, Excel does not inherently know HVAC physics. It requires input data. This creates the demand for the "ASHRAE Duct Fitting Database in Excel."

For fittings at low velocities (e.g., VAV systems at part load), the (C_o) varies significantly. Your Excel tool must include a correction algorithm based on .

To use the database, follow these steps:

Are you looking to template, or are you trying to troubleshoot an existing sheet?

=INDEX(Data_Grid, MATCH(Row_Input, Row_Range, 1), MATCH(Col_Input, Col_Range, 1)) Handling Intermediate Values (Linear Interpolation) ASHRAE tables list distinct intervals (e.g., ). If your design features an intermediate ratio like

I can provide tailored formula examples, specific fitting equations, or structure a template layout based on your preferences. Share public link

Many HVAC software vendors license the ASHRAE database and repackage it as a clean Excel add-in. Tools like , Trane Duct Designer , or Wrightsoft offer export features that dump the database into CSV/Excel. Some sell the spreadsheet alone for ~$50-$150.

The ASHRAE Duct Fitting Database contains aerodynamic performance data for over 200 duct fittings. The system categorizes these fittings by geometry, cross-section (round, rectangular, or flat oval), and function (elbows, transitions, junctions, and obstructions).

Format the exact in Excel.

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