The ASHRAE Duct Fitting Database is a desktop application containing loss coefficient data for more than 200 round, rectangular, and flat oval duct fittings. Users select specific fitting geometries and input design parameters such as dimensions and flow rates. The software then calculates the loss coefficient ( Cocap C sub o ) and the total pressure drop for that specific component. Key Features of the Software
| Tool | Key Features | Pricing / Access | DFDB Method | | :--- | :--- | :--- | :--- | | | Real‑time pressure loss, 240+ fittings, cloud access, export to Excel, pictorial guides | Commercial ($477) + free Lite version (iOS) | All three methods built in | | Autodesk Revit | Equal Friction & Static Regain methods built into BIM modeling; free Table Viewer add‑in for seeing DFDB tables | Commercial (subscription) | Equal Friction, Static Regain | | Elite Software DUCTSIZE | Static regain, equal friction, constant velocity; unlimited sections; fan noise data; works with AutoCAD | $295 – $499 (free demo avail) | Equal Friction, Static Regain | | McQuay Duct Sizer | Fast, free duct sizing; handy for quick checks; but lacks surface‑roughness adjustment (Ɛ) – always uses a default value | Free | Equal Friction (implicit) | | ARKANCE Pressure Drops | Automates pressure drop calc without Revit’s default tables; works with DFDB | Commercial (free trial likely) | Custom DFDB | | MEPEXCEL Duct Fitting Calculator | Excel‑based (VBA) tool; uses ASHRAE coefficients for pressure loss calc | Freemium / Paid | DFDB lookup |
: Executable files downloaded from unauthorized file-sharing networks often contain viruses, spyware, or ransomware. ashrae duct fitting database version 60005 free
: It allows users to search by fitting type, category, and configuration. Supported Fitting Types Supply, return, and exhaust systems. Elbows, transitions, junctions, and obstructions. Round, rectangular, and flat oval geometries. Understanding Version 6.00.05
– ASHRAE actively monitors piracy, and the files often contain malware. Instead: The ASHRAE Duct Fitting Database is a desktop
The DFDB isn't just a static lookup table—it's the computational backbone for three major duct design strategies.
The confusion around a "free" version stems from two legitimate sources: Key Features of the Software | Tool |
This specific version updated several critical database tables and added new flexible duct and elbow options to ensure calculations align with the latest industry standards. ASHRAE Duct Fitting Database 6.1 Free Download
It includes a subset of fittings from the full database for performing pressure loss calculations in both I-P and SI units.
Frustrated, Leo walked to the back of the office where the "Legacy Library" lived—a graveyard of physical binders and dusty CDs. He found an old disc labeled ASHRAE DFDB v4.0 . It was ancient. Using it would be like trying to run a Tesla on steam; the loss coefficients would be outdated, potentially leading to an oversized fan and a blown budget.
