Ashrae Duct Fitting Database Version. 6.00.05 [OFFICIAL]

Understanding the ASHRAE Duct Fitting Database Version 6.00.05

This release focuses on critical bug fixes and expanded range data to improve calculation reliability: New Fittings Added:

The ASHRAE Duct Fitting Database is a quiet workhorse of HVAC design: a standardized catalog of pressure-loss coefficients and equivalent lengths for hundreds of fittings. Version 6.00.05 doesn’t change the game's premise — it refines the numbers that determine how much fan energy you’ll spend moving air through a system. For design engineers, energy modelers, and commissioning teams, even small database tweaks cascade into measurable impacts on equipment sizing, fan selection, energy simulations, and operating costs.

The database was originally developed through research projects such as , which populated the database with data for 228 duct fittings and verified its accuracy. Subsequent projects, including RP‑551 , have refined the loss coefficients for specific fitting constructions, such as elbows with varying radii of curvature. ashrae duct fitting database version. 6.00.05

The ASHRAE Duct Fitting Database is a comprehensive digital catalog of resistance coefficients (K‑values) for hundreds of standard duct fittings. It includes detailed loss coefficient tables for more than , each accompanied by a clear pictorial outline. For any given fitting, engineers enter the flow rate and relevant dimensional data, and the software instantly returns the loss coefficient along with the associated pressure drop.

While the ASHRAE DFDB Version 6.00.05 is the gold standard for loss coefficients, it is often used alongside complementary tools:

The ASHRAE Duct Fitting Database is continuously updated and improved to reflect the latest research and testing data. Future versions are expected to include even more features and enhancements, such as: Understanding the ASHRAE Duct Fitting Database Version 6

The consultant nodded. "We're also on 6.00.05. Approved."

: It is the standard software for determining External Static Pressure (ESP) required for proper fan and equipment selection.

The data within the tool is structured alphabetically and numerically by fitting configuration: Duct Fitting Database - ASHRAE It includes detailed loss coefficient tables for more

Each fitting in the database is identified by a (e.g., CD3-22, SR4-3). This systematic coding makes it easy to cross-reference with ASHRAE handbooks and ensures precise communication between engineers. The database also features pictorial outlines of each fitting, which is an invaluable feature for quickly identifying the correct geometry for a given design.

In the world of Heating, Ventilation, and Air Conditioning (HVAC) design, precision is paramount. One of the most critical, and often underestimated, aspects of system design is accurately calculating the pressure losses through duct fittings. An elbow, a transition, or a tee can introduce significant resistance, and underestimating these losses can lead to system inefficiency, higher energy costs, and occupant discomfort.

The utility of the DFDB lies in its comprehensive coverage of fitting types. Version 6.00.05 includes loss coefficient data for different fittings in three primary shapes: round , rectangular , and flat oval ducts. For mobile users, the DFDB app boasts coverage of 250+ fittings . These fittings are further categorized by their function:

Save individual fittings or entire projects. Export the data as CSV or XML for further analysis in Excel, Revit, or other BIM/CFD tools.