: Identify the longest duct run or the route with the most complex fittings (the path of highest resistance). Input Fitting Data : For each section, use the ASHRAE DFDB software to get the pressure loss (in Pascals or inches w.g.). Sum the Losses : Your Excel sheet should total the losses from: Straight Ducts : Calculated as (Length × Friction Rate).
The ASHRAE Duct Fitting Database (DFDB) is a professional resource used to calculate pressure losses in HVAC systems. While the core database is a standalone software or web application, it integrates with Excel primarily through report exports rather than a native spreadsheet format. Core Features ashrae duct fitting database excel
Start by auditing your current duct design workflow. Do you spend more than 2 hours a week looking up loss coefficients? If yes, download a pre-built ASHRAE Excel database today, or set aside one afternoon to build your own using the steps above. Your future self—and your building's energy bill—will thank you. : Identify the longest duct run or the