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It is important to clarify that the full ASHRAE Duct Fitting Database (DFDB) Version 6.00.05 is a commercial product. It is officially available for purchase through the ASHRAE Bookstore .
The software includes a dynamic look-up table. For any given fitting, users input specific aerodynamic parameters and the system returns the exact coefficient of resistance and the resulting pressure loss.
The database uses the fundamental fluid dynamics equation for dynamic pressure loss ( ) in a fitting: Δp=Co×pvdelta p equals cap C sub o cross p sub v
Engineers seeking specific versions must look closely at what technical advancements were implemented in version 6.00.05 . This minor revision resolved critical computation bugs from older iterations and vastly expanded allowable dimension thresholds. Fitting Code Fitting Type & Function Changes implemented in Version 6.00.05 Straight Duct, Round Added constant equal friction calculation properties. CD11-3 Straight Duct, Round Integrated new velocity-limited design constraints. CD3-22 Elbow, Flexible center-line radius parameters. CD3-23 Elbow, Flexible center-line radius parameters. ED5-2 Bullhead Tee with Vanes Corrected a text table extraction bug present in v6.00.04. ER2-2 Transition fitting Fixed underlying mechanical equations for exhaust runs. SR4-3 / ER4-3 Pyramidal Transitions Increased input limits for diameter ( D1cap D sub 1 ), heights ( Hocap H sub o ), and widths ( Wocap W sub o CR3-17 / CR9-3 Rectangular Elbows / Tees Expanded physical dimensional ranges ( ) for heavy commercial ductwork. How the Calculation Engine Operates
