Standard ASHRAE equations assume standard air density (
While not a full database download, this works if you only need specific fittings for a project.
: Always match the exact ASHRAE fitting codes (e.g., CD3-1, ER4-3, SD5-1). This keeps your sheets clear and auditable for peer reviews or building authority checks. ashrae duct fitting database excel link
Summary
Use the software's export function to output the data as a .csv or .txt file. Standard ASHRAE equations assume standard air density (
To answer the search directly: There is no legitimate free public link to a complete, official ASHRAE Excel file. However, the official link is obtained through purchase from the ASHRAE Bookstore (search for "Duct Fitting Database – Electronic"). That purchased product provides a secure download link to an Excel-ready database (either as an .xlsm or an Access file that Excel can read).
| Problem | Solution | |---------|----------| | Can't find DLL | Place DLL in C:\Windows\System32 or use full path in VBA/Python | | Bad calling convention | Add StdCall to VBA declare | | 32-bit vs 64-bit mismatch | Use 32-bit Excel + 32-bit DLL, or recompile DLL for 64-bit | | Error code 3 (fitting not found) | Verify Fitting ID from ASHRAE tables (e.g., elbow = 400–409 series) | | Co = 0.0 for valid fitting | Check parameter units – some require radians, degrees, or aspect ratios | Summary Use the software's export function to output
The standard ASHRAE DFDB desktop application allows users to build a specific duct run within the software and export the final calculation sheets.
The ASHRAE Duct Fitting Database is a comprehensive repository of aerodynamic performance data for HVAC duct fittings. It contains loss coefficient factors ( Cocap C sub o ) for hundreds of fittings, including: Supply, return, and exhaust configurations. Round, rectangular, and flat oval geometries. Junctions, elbows, transitions, fan connections, and hoods.
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