Ashrae Duct Fitting Database Version. 6.00.05 File

Use Microsoft Query or Power Query to connect directly to ASHRAE_DFDB_v6.00.05.mdb. Write SQL queries:

SELECT FittingType, LossCoeff, RefVelocityID 
FROM tbl_fittings 
WHERE FittingID = 'RE1-5';

Then automatically calculate pressure drops for entire duct networks.

Suppose a site measurement shows total static pressure 0.6 in. w.g. above design value. Using the database, you can systematically check each fitting's design C vs. as-built conditions. A common discovery: short-radius elbows installed instead of long-radius, raising C from 0.15 to 0.45.

Below is a concise, structured report covering the ASHRAE Duct Fitting Database version 6.00.05: what it contains, key changes/notes, compatibility, data format, typical use cases, validation and quality guidance, and recommended next steps. ashrae duct fitting database version. 6.00.05

Fix: Right-click DFDB.exe → Properties → Compatibility → Change high DPI settings → Override high DPI scaling (Application).

The ASHRAE Duct Fitting Database (DFDB) is recognized globally as the industry-standard reference for calculating pressure losses in HVAC duct systems. Specifically, Version 6.00.05 represents a significant iteration of this essential software tool, providing engineers, designers, and contractors with the data necessary to model airflow systems with high precision.

Developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), this database is the digital companion to the fitting loss coefficients found in the ASHRAE Handbook—Fundamentals. It moves beyond static tables, offering dynamic calculation capabilities that streamline the HVAC design process. Use Microsoft Query or Power Query to connect

Let’s say you need the loss coefficient for a 90° round radiused elbow (R/D = 1.5) with no vanes at 2000 CFM in a 16-inch diameter duct.

Step-by-step using Version 6.00.05 Viewer:

  • Result: Fitting ID = RE1-5 (example). Loss Coefficient (C₀) = 0.18 (referenced to upstream velocity pressure).
  • Calculate velocity pressure (Pv):
    V = Q/A = 2000 CFM / (π*(1.33 ft)²/4) ≈ 2000/1.39 ≈ 1438 fpm
    Pv = (V/4005)² = (1438/4005)² ≈ 0.129 in.wg
  • Total pressure drop (ΔP): ΔP = C₀ * Pv = 0.18 * 0.129 ≈ 0.023 in.wg

    • Version 6.00.05 also provides an uncertainty band (±5% for most radiused elbows), which earlier versions did not disclose. Then automatically calculate pressure drops for entire duct

    ASHRAE Technical Committee 5.2 (Duct Design) has announced that version 7.0 is in early development. Planned features include:

    However, no release date has been set for 7.0. Therefore, Version 6.00.05 remains the most current, stable, and authoritative duct fitting database through at least 2026.

    The ASHRAE Duct Fitting Database (DFDB) Version 6.00.05 remains the industry gold standard for calculating pressure losses in HVAC duct systems. While the user interface retains a legacy "database" feel, the underlying calculation engine is indispensable for engineers performing detailed load calculations, CFD model validation, or commissioning analysis. This version provides critical updates to the ASHRAE Handbook data, making it a necessary upgrade for professionals relying on precision over "rules of thumb."