ASHRAE Duct Fitting Database (DFDB) Version 6.00.05

The is a high-precision digital tool designed for HVAC engineers to calculate pressure loss across complex duct networks. Developed by ASHRAE in collaboration with Carmel Software Corporation , this version serves as the industry standard for determining duct fitting loss coefficients (C-factors). Key Features of Version 6.00.05

How to Use the Database: A Practical Example

ASHRAE Duct Fitting Database Version 6.00.05

serves as a vital bridge between theoretical research and practical application. By digitizing the extensive research of ASHRAE into an accessible interface, it empowers mechanical engineers to design systems that are not only compliant with code but optimized for performance and energy efficiency. For any professional involved in the design of air-distribution systems, this version remains a cornerstone tool in the engineering toolkit.

Many universities use the DFDB for capstone projects. Version 6.00.05 includes a "Compare Fittings" feature—students can visualize how C changes with aspect ratio or turning vanes, reinforcing fluid mechanics concepts.

Mobile Accessibility

: A "Lite" app version exists for field use, allowing engineers to perform quick on-site calculations for a subset of common fittings. 4. Historical Context

Version 6.00.05 also provides an uncertainty band (±5% for most radiused elbows), which earlier versions did not disclose.

Maintain version consistency.

Do not mix coefficients from v5.x with v6.00.05 in the same project. Save a copy of the DFDB with your project archive.