Expanded valid input ranges for various fittings, including transitions and elbows (e.g., , ER4-3 , CR3-17 , and CR9-3 ). 3. Engineering Application and Compliance
This database remains the industry standard for calculating dynamic losses (loss coefficients, or "C" values) for virtually every duct fitting configuration—from simple elbows and tees to complex transitions and turning vanes. ashrae duct fitting database version. 6.00.05
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. Expanded valid input ranges for various fittings, including
