Excel | Ashrae Duct Fitting Database

If you are currently building a custom design sheet, let me know:

): Automated lookup based on the selected fitting and ratios. ( Overcoming Technical Implementation Challenges

The is a valuable, accessible engineering tool for HVAC system designers. While it lacks automation, its transparency and direct link to the ASHRAE Handbook make it ideal for manual duct design, peer reviews, and low-budget projects. Users should be aware of the need for manual interpolation and version matching to ensure accuracy.

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

To ensure your Excel sheet covers a standard commercial project, prioritize cataloging these common ASHRAE fitting families: Fitting Code Series Description Critical Variables for Excel Lookup Common Round Ducts Diameter, Reynolds number, surface roughness CD3 Series Round Elbows Bend angle, Radius-to-Diameter ratio ( SD3 Series Rectangular Elbows Turning vanes, Aspect ratio ( ), Smooth vs. mitered SD4 Series Rectangular Transitions Converging/diverging angles, length of transition SD5 / CD5 Series Tees and Junctions Branch-to-main flow ratio ( ), Area ratios Best Practices for Maintaining a Duct Fitting Workbook

Generate clean, standardized pressure drop reports that are easy for clients and code officials to review.

= Velocity pressure of the air stream (Pa or in. wg.), calculated as in Imperial units or in Metric units. If you are currently building a custom design

Now, you can build your main system model, incorporating all the components:

Integrating the DFDB into an Excel-based workflow is straightforward. The core of the database's utility for Excel users is its ability to provide accurate input data for custom spreadsheets. Here is a recommended process:

coefficients, categorized by geometry (round, rectangular, flat oval) and fitting type (elbows, entries, exits, transitions, junctions). Each fitting code follows a structured format, such as: : Common Round Elbow SD5-1 : Supply Rectangular Tee ER4-3 : Exhaust Round Transition Why Integrate the ASHRAE Database into Excel? Users should be aware of the need for

If you want to build or improve a specific calculator, let me know:

=FORECAST.LINEAR(Your_Aspect_Ratio, Known_Coefficient_Range, Known_Aspect_Ratio_Range)

Do you need the to build your own program?

For duct mounted in wall (hood, flanged, unflanged), loss coefficients vary with the ratio of duct diameter to entry dimension. A typical entry might have a C o of 0.50 for a flush‑mounted duct, decreasing to 0.10 for well‑rounded entries. Smooth converging bellmouth entries can achieve C o values as low as 0.03 with r/D ≥ 0.20.