Ashrae Duct Fitting Database Excel Link -
Several HVAC tools provide Excel add-ins already linked to ASHRAE DFDB:
| Software | Excel Integration | |----------|------------------| | Elite Software DuctSize | Exports to Excel with loss coefficients | | Trane Ductulator | Manual lookup only (not direct link) | | ASHRAE HVAC Toolkit | Includes Excel examples (requires purchase) | | SixBit Software (DuctLink) | Excel add-in for DFDB ($$) |
✅ Recommended for engineers who don’t code: Buy DuctLink Excel Add-in – provides
=ASHRAECo(FittingID, Dim1, Dim2, Dim3)directly.
| Your situation | Best method | |----------------|--------------| | Occasional use, no coding | Buy DuctLink add-in | | Already have ASHRAE DLL, use Excel daily | VBA wrapper (Method A) | | Python user, want flexible reporting | xlwings + ctypes (Method B) | | Cannot purchase DLL | Static lookup table (Section 7) |
For the official ASHRAE DFDB DLL and documentation, visit:
www.ashrae.org/dfdb (members only)
Introduction
The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) provides a comprehensive duct fitting database in Excel format, which is a valuable resource for engineers, designers, and contractors working on HVAC systems. The database contains a wide range of duct fittings, including elbows, tees, wyes, and reducers, among others.
ASHRAE Duct Fitting Database Excel Link
The ASHRAE Duct Fitting Database Excel file can be downloaded from the ASHRAE website. The database contains a collection of duct fitting loss coefficients, which are essential for designing and analyzing HVAC duct systems. The database is in Excel format, making it easy to use and accessible to a wide range of users. ashrae duct fitting database excel link
Features of the ASHRAE Duct Fitting Database
The ASHRAE Duct Fitting Database Excel file offers the following features:
Benefits of Using the ASHRAE Duct Fitting Database
The ASHRAE Duct Fitting Database Excel file offers several benefits to users, including:
How to Access the ASHRAE Duct Fitting Database Excel Link
To access the ASHRAE Duct Fitting Database Excel file, follow these steps:
By utilizing the ASHRAE Duct Fitting Database Excel file, engineers, designers, and contractors can improve the accuracy and efficiency of their HVAC duct design and analysis, ultimately leading to better-performing and more energy-efficient buildings.
While ASHRAE does not provide a direct "Excel download" for its entire Duct Fitting Database (DFDB), the current ASHRAE Duct Fitting Database (DFDB) v6.0 is primarily a cloud-based subscription service. Professionals typically use the software to calculate specific fitting losses and then transfer that data into their own Excel-based static pressure calculation sheets. Official ASHRAE Database Resources Several HVAC tools provide Excel add-ins already linked
Web-Based Subscription (v6.0): The primary tool for current data, accessible via an annual subscription on the ASHRAE Bookstore.
Mobile App (Lite): A free version called Duct Fitting Database Lite is available for iPhone and iPad, allowing for quick field calculations.
Desktop Software (v5.0.10): Older standalone versions were available for local installation and are still referenced for legacy project use. Integrating with Excel
Since a native Excel file of the database is not publicly available for free, engineers often use one of these methods: Manual Entry: Calculate the loss coefficient ( Cocap C sub o
) or pressure loss in the DFDB software and copy it into a custom Excel spreadsheet to determine the External Static Pressure (ESP) of the critical path.
Third-Party Excel Tools: Sites like MEP Excel offer custom-built Duct Fitting Calculators that use VBA and external data folders to mimic ASHRAE functions within an Excel interface.
Report Exporting: Some versions of the DFDB mobile app and desktop software allow you to share or export reports as spreadsheets for further analysis. Key Formulas Used in Database Excel Sheets
If you are building your own sheet based on ASHRAE data, you will need to account for: ✅ Recommended for engineers who don’t code: Buy
If you or your firm owns the ASHRAE Handbook – Fundamentals (print or PDF) , you can transcribe the tables for fittings you use most often. However, this is tedious for the entire database.
Better approach: Purchase the ASHRAE Handbook on CD/DVD or Online Access (cost approx. $200–$300). The digital version often includes CSV or tabulated data for many fittings.
Steps to get into Excel from the CD:
Pro Tip: Check if your university or company has an ASHRAE Digital Library subscription—you may access the database online without buying individual copies.
The ASHRAE Duct Fitting Database (DFDB) is the industry-standard reference for designing and analyzing ductwork systems. It provides the loss coefficients ($C$-values) required to calculate pressure losses for various duct fittings (elbows, transitions, take-offs, etc.).
Historically, engineers relied on the charts and tables printed in the ASHRAE Fundamentals Handbook. Today, the database is primarily maintained as a digital application.
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:
Each fitting has a unique ID code (e.g., "E1-1" for a 90° smooth elbow) and its loss coefficient depends on geometry ratios (e.g., r/D, W/H, angle, area ratios). The official data is maintained by ASHRAE Technical Committee (TC) 5.2.
Important Note: The full database is copyrighted by ASHRAE. You will not find a legitimate, permanent "free Excel download link" on a public website. However, ASHRAE provides licensed access to the data, and several legitimate pathways allow you to bring it into Excel.