: Engineers use the official ASHRAE DFDB Desktop Software or the ASHRAE DFDB Lite App to input specific airflow (CFM) and dimensions. The resulting pressure loss (typically in Pa or in. w.g.) is then manually entered into a custom Excel ESP calculation sheet to sum up the total system resistance.
including elbows, transitions, junctions, and dampers. ashrae duct fitting database excel
The DFDB is a comprehensive repository containing loss coefficient tables and pictorial outlines for over 200–250 different round, rectangular, and flat oval duct fittings. It covers: duct functions. : Engineers use the official ASHRAE DFDB Desktop