Includes detailed geometric illustrations of each fitting type to prevent design errors. Why Engineers Search for a "Patched" or PDF Version
While "patched" often refers to unofficial modifications, official updates for the ASHRAE Duct Fitting Database (currently Ver. 6.0) have included: Duct Fitting Database - ASHRAE
: Used for high-velocity systems to ensure uniform airflow at all terminals. Constant Velocity
Using the DFDB effectively involves a straightforward workflow:
🛠️ The Core Issue: Legacy DB Failures on Modern Windows
: Users input dimensions (width, height), flow rates, and density to immediately receive velocity, loss coefficients ( cap C sub o ), and pressure loss data. Project Management
| Feature | Official Database | Integrated in 3rd-party BIM | | :--- | :--- | :--- | | | Directly from ASHRAE; most up-to-date data. | Embedded in software (e.g., Revit). Historical versions often have errors. | | Access Method | Subscription (cloud) or free mobile Lite app. | Built-in .xml file in the software package. | | Fitting Coverage | Full database of 240+ fittings. | Variable; often limited or mismapped to incorrect IDs. | | Primary Use Case | Design, analysis, and manual verification of losses. | Automated calculations within a BIM project. | | Patching & Updates | Regularly updated via new versions and errata. | Updated only with major software releases, if at all. |
Over 200 different round, rectangular, and flat oval duct fittings.
The underlying equations, methodologies, and a select number of fitting loss coefficient tables are published in the (specifically Chapter 21, "Duct Design").
The ASHRAE Duct Fitting Database is a technical software tool and comprehensive reference containing pressure loss coefficients for over 200 types of HVAC fittings. While the "database" itself is typically an interactive application available on CD or through ASHRAE's website , key excerpts and supporting documentation are often published as PDF files. Core Resources and Access
: Reports can be sent directly as formatted HTML emails.
The ASHRAE Duct Fitting Database PDF Patched is a significant resource for the HVAC industry, as it provides a standardized and reliable source of duct fitting data. The database has several benefits, including: