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
