Create dedicated columns for the unique physical properties of each duct section: (e.g., AHU-1 Runout) Airflow Rate (CFM or L/s) Duct Shape & Dimensions (Diameter or Width x Height) ASHRAE Fitting Code (e.g., CR3-1 for a round elbow) Geometric Ratios (e.g., Step 2: Configure the Lookup and Calculation Engine

Use the Data > Get Data > From Text/CSV feature in Excel to load the tables into a dedicated reference sheet.

Multiply your looked-up coefficient by the calculated velocity pressure: = Fitting_Coefficient * Velocity_Pressure

There is no direct "Excel version" of the entire database sold by ASHRAE; however, several methods exist to link this authoritative data with your spreadsheets: 1. Manual Data Transfer

The ASHRAE DFDB is a comprehensive repository of over 200 loss coefficient tables for round, rectangular, and flat oval duct fittings. It allows users to input airflow (CFM) and dimensions to automatically obtain the loss coefficient ( ) and the associated pressure loss.

Create columns for user inputs representing the physical properties of the duct run: (e.g., ED1-1 for a round elbow) Duct Geometry (Diameter or Width/Height) Airflow Rate (CFM or L/s) Velocity (FPM or m/s) Step 2: Establish the Reference Criteria

To effectively use an ASHRAE duct fitting link in Excel, you must have the following data points ready:

It covers supply, exhaust, and common (supply/return) duct fittings.

The database covers:

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