Ashrae Duct Fitting Database Version 60005 Jun 2026

The DFDB is not a standalone tool in isolation. Its data is powerful because it can be integrated into larger workflows. For example, Autodesk Revit's Equal Friction and Static Regain duct sizing methods use the ASHRAE Duct Fitting Database to determine losses for various fittings. This integration allows for more accurate Building Information Modeling (BIM) from the earliest design stages, bridging the gap between theoretical calculations and practical engineering applications.

: Fittings can be grouped and saved into individual project files, which are small enough for easy transfer and navigation.

ΔP=Co×Pvcap delta cap P equals cap C sub o cross cap P sub v Pvcap P sub v represents velocity pressure (

A critical educational and functional aspect of the database is the distinction between friction and shock (dynamic) loss. While duct design software (like Revit or Carrier HAP) handles the straight-run friction loss via the Darcy-Weisbach equation, the DFD focuses on the . Version 6.0.005 excels at visualizing why a fitting loses energy. By isolating the turbulence created at the heel and throat of an elbow, the database provides data that helps engineers justify the cost of higher-grade fittings (like turning vanes or radius elbows) versus cheap, inefficient square-throat designs.

The database often provides (C) for Static Pressure loss. If your system design uses Total Pressure , you must apply a conversion factor listed in the Appendix of version 60005. ashrae duct fitting database version 60005

Comprehensive Guide to the ASHRAE Duct Fitting Database (Version 6.00.05)

: Expanded the allowable input dimensions for multiple fittings, including SR4-3 , ER4-3 , CR3-17 , and CR9-3 .

Perhaps the most valuable contribution of the DFD Version 6.0.005 is its role in predicting the .

A university used the new oval duct fittings to squeeze a high-velocity system into a shallow ceiling plenum. Without accurate coefficients, they’d have oversized the fan by 20%. The DFDB is not a standalone tool in isolation

Instead of static look-up tables, the software calculates coefficients dynamically. Users input specific dimensional ratios (e.g., radius-to-diameter ratio , aspect ratio ) and flow ratios ( ). The software instantly computes the exact Cocap C sub o

Z-shaped elbows, vaned elbows, obstructions, and converging/diverging take-offs.

: An updated graphical user interface accelerates the process of selecting inputs for converging and diverging tees, elbows, and entries.

Covers round, rectangular, and flat oval duct geometries. While duct design software (like Revit or Carrier

Integration with ASHRAE Handbooks: The database serves as the digital companion to the ASHRAE Handbook—Fundamentals. While the handbook provides the theory, Version 6.00.05 provides the practical, calculable values needed for real-world application. Why Accuracy Matters in Modern HVAC

: Diverging/converging tees, wyes, transitions, elbows, and hoods. 2. Enhanced Calculation Engine

Let’s walk through a real-world example: A at 4,000 CFM.

: Engineers can quickly filter fittings by shape (round, rectangular, flat oval), type (elbow, transition, junction), and system zone.

Do you need an example of a (e.g., a rectangular elbow with vanes)?