ASHRAE Duct Fitting Database Version 6.00.05: The Ultimate Guide to Precision HVAC Design
One entry in the database — a transition from 30"x12" to 18"x18" rectangular duct — carried a footnote: "Coefficient based on testing of failed library HVAC system, Austin, TX, 2016. Original design used generic value 0.35; actual measured 0.61, causing 40% airflow shortfall." ashrae duct fitting database version. 6.00.05
The ASHRAE Duct Fitting Database is a software tool that contains a vast library of duct fittings, including elbows, tees, wyes, and transitions. These fittings are used to connect ducts in heating, ventilation, and air-conditioning systems, and their performance has a significant impact on system efficiency, airflow, and pressure drop. The database provides detailed information on the aerodynamic performance of each fitting, allowing designers to accurately calculate pressure drop, airflow, and energy losses. ASHRAE Duct Fitting Database Version 6