Ashrae Duct Fitting Database Excel Jun 2026

Users can save multiple fittings into a single project file for total system analysis. Excel Integration & Data Access

This provides a practical method for building a custom duct calculator directly within Excel, independent of the official DFDB.

: Engineers use the official ASHRAE DFDB Desktop Software or the ASHRAE DFDB Lite App to input specific airflow (CFM) and dimensions. The resulting pressure loss (typically in Pa or in. w.g.) is then manually entered into a custom Excel ESP calculation sheet to sum up the total system resistance.

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

You can quickly calculate losses for multiple fittings in a single sheet. ashrae duct fitting database excel

-factors) for hundreds of duct fittings. It is based on extensive research conducted by ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers).

Fittings_Library : A master index matching ASHRAE fitting codes (e.g., SD5-1) to their respective descriptive names.

Do you need formulas for or SI units (L/s/Pascals) ?

: Calculations update instantly as you adjust dimensions or airflow. Subscription Costs Users can save multiple fittings into a single

Advanced sheets utilize custom macro functions to automate polynomial interpolation. This ensures precision when a design ratio falls between two values explicitly published in the ASHRAE tables. Best Practices for Maintaining a Custom Excel Database

Always use official ASHRAE codes (e.g., SD, CD, ED prefixes) to maintain consistency across team projects.

This article explores the ASHRAE Duct Fitting Database, the advantages of creating a personal Excel version, how to implement it, and best practices for pressure drop calculations. What is the ASHRAE Duct Fitting Database?

This tab houses the raw ASHRAE fitting coefficients. Because coefficients vary based on geometric ratios (e.g., radius ratio , aspect ratio ) and flow ratios ( ), the data must be organized systematically. The resulting pressure loss (typically in Pa or in

An Excel calculation sheet displays the logic clearly:

: Select the longest duct route or the one with the most fittings to determine the maximum pressure drop. Tag Components

If you prefer to build a custom tool without a live link to the database, you can use the and Colebrook equations found in the ASHRAE Handbook of Fundamentals .