When air moves through a straight duct, it experiences friction loss. However, when that air hits an elbow, a transition, or a junction, the airflow is disrupted. This disruption creates turbulence, which results in a .
Supports both I-P (Inch-Pound) and SI (International System) units. ashrae duct fitting database download
Some HVAC design suites include a licensed subset of the database. Check: When air moves through a straight duct, it
The database quantifies this loss using the fundamental equation: it experiences friction loss. However
): The actual resistance the fan must overcome for each component.
Includes fittings for supply, exhaust, and common (supply/return) duct functions.
Ensure you are downloading the legitimate version from ASHRAE to guarantee you are using verified, peer-reviewed data. Third-party "cracked" versions may contain incorrect algorithms or corrupted data tables.