Part 3 of four-part series: Fan System Effects In the lab, fans are tested with ideal inlet and outlet conditions: straight, uniform flow into the impeller and typically, a section of straight duct on the discharge to allow the velocity profile to smooth out and static pressure to develop. In the field, that ideal setup
Fan System Effects: Abrupt Change in Cross-Sectional Area
Part 2 of four-part series: Fan System Effects Abrupt changes in duct cross-sectional area are a frequent cause of fan system effects. When air is forced to expand or contract too quickly near a fan inlet or outlet, the flow separates, becomes turbulent, and no longer matches the smooth conditions assumed by the fan performance
Fan System Effects: What and How
Part 1 of four-part series: Fan System Effects Fan system effects are performance losses caused by poor airflow conditions at or near a fan’s inlet or outlet, such as swirl, turbulence, abrupt transitions, fittings too close to the fan, or other obstructions in the ductwork. For engineers, contractors, and specifiers, the practical issue is simple:
