ASHRAE Duct Fitting Database (DFDB) is an essential tool for HVAC design engineers used to calculate static pressure loss for various duct fittings. While the official ASHRAE product is a standalone cloud-based or mobile application, it is commonly used in conjunction with Excel for comprehensive External Static Pressure (ESP) calculations. Overview of ASHRAE Duct Fitting Database
In Duct_Calc, cell C2 (where you need the loss coefficient): ashrae duct fitting database excel
C₀, C₁, C₂, etc.) based on selection