) for over 200–250 geometric fittings including supply, exhaust, and common return systems. ⚙️ Core Functionality & Features
Users enter data such as flow rate (CFM or L/s), duct dimensions (height, width, or diameter), and fitting geometry (radius ratio, angle). ashrae duct fitting database 2016
Each fitting record contains:
Width, height, or diameter of the inlet and outlet. ) for over 200–250 geometric fittings including supply,
that a fan must overcome to move conditioned air through a building. Duct Fitting Database - ASHRAE that a fan must overcome to move conditioned
Fan selection is heavily dependent on total static pressure. If an engineer underestimates the pressure loss from fittings, the selected fan will operate at a higher speed than intended to meet airflow requirements. This pushes the fan to the right on its performance curve, often resulting in higher noise levels and increased energy use. The DFDB helps ensure the initial fan selection is accurate, mitigating acoustical issues downstream.
Summary