Fitting Database Excel Link — Ashrae Duct

: Supports both I-P (Imperial) and SI (International System) units. Workflow for ESP Calculation

ASHRAE Duct Fitting Database (DFDB) is a critical tool for HVAC engineers to calculate pressure losses and design efficient air distribution systems. While ASHRAE primarily offers this data through a cloud-based subscription service or a standalone desktop application , many engineers use

Create a standardized tabular layout with the following column headers: Duct Section/Node (e.g., Node 1 to Node 2) Airflow Rate (CFM or L/s) Duct Shape & Size (Width x Height, or Diameter) Velocity (FPM or m/s) — Calculated via formula Velocity Pressure ( Vpcap V sub p ) — Calculated via formula ASHRAE Fitting ID (e.g., CR3-1) Fitting Loss Coefficient ( Cocap C sub o ) — The Linked Database Value Fitting Pressure Drop ( ) — Calculated ( Step 2: Establish the Database Link ashrae duct fitting database excel link

Summary of what you’ll achieve

The ASHRAE Duct Fitting Database is a collection of loss coefficients (C-factor, or technically Co for round and Co' for rectangular) for hundreds of HVAC fittings, including: : Supports both I-P (Imperial) and SI (International

This file requires Adobe Acrobat Reader, available free from Adobe. Install the program to view and print PDF files.

The ASHRAE Duct Fitting Database is a comprehensive collection of loss coefficients ( Cocap C sub o Install the program to view and print PDF files

Actual function names depend on your DLL version – consult the DFDB documentation.

Have you built your own DFDB Excel tool? Or are you still flipping through the handbook? Let me know in the comments below.

Disclaimer: This post is for educational purposes. ASHRAE does not endorse any specific third-party Excel file. Always license the official database for professional design.