Aerodynamic performance and application of unhoused fans

Presents the differences in structure, performance test method and performance calculation between unhoused fans and housed fans. The performance test results show that the air volume and pressure of an unhoused fan should not be determined based on the nominal values as a housed fan when applied to an air conditioning unit. There are some differences between the nominal values and actual values of an unhoused fan in that case. Based on the understanding and testing results of the unhoused fan, puts forward some suggestions for designing fan rooms. Considers that it is necessary to have a fan room when using unhoused fans and choose the values in the middle area of the fan performance curve as much as possible when calculating.