Each fitting has a unique (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 .
Check if your university or company has an ASHRAE Digital Library subscription —you may access the database online without buying individual copies.
Open VBA editor ( Alt+F11 ), insert a module, and declare:
) obtained from the DFDB for each fitting along the critical path. Access and Resources Cloud-Based Version ashrae duct fitting database excel link
Open the ASHRAE DFDB application and configure your specific duct system parameters (e.g., fitting type, geometry, flow rate).
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This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Duct Fitting Database - ASHRAE Each fitting has a unique (e
ASHRAE offers a cloud-based version of the DFDB via an annual subscription. This version includes loss coefficient tables for over 200 fitting types (round, rectangular, and flat oval).
Best Practices for Excel-Based Duct Static Pressure Calculations
For field work, ASHRAE offers a free mobile application called DFDB Lite, available on the Apple App Store. This app allows users to perform pressure loss calculations for select supply, common, and return/exhaust fittings in both I-P and SI units. Inputs can be adjusted by touch, making it convenient for on-site design adjustments and quick verifications. Open VBA editor ( Alt+F11 ), insert a
) for various duct configurations. Manually transferring this data into design spreadsheets is slow and causes errors. Linking the ASHRAE Duct Fitting Database with Microsoft Excel automates your calculations, increases design speed, and ensures compliance with ASHRAE standards. What is the ASHRAE Duct Fitting Database?
The database covers hundreds of fittings, including: