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A fan unit is designed for installation in ducting systems or in similar casings in air conditioning and ventilation systems. The fan unit has a freely turning radial impeller without any spiral housing and has a driving motor for the impeller. Downstream from the outlet of the impeller, there is a

A fan unit is designed for installation in ducting systems or in similar casings in air conditioning and ventilation systems. The fan unit has a freely turning radial impeller without any spiral housing and has a driving motor for the impeller. Downstream from the outlet of the impeller, there is a guiding structure for redirecting the flow coming radially out of the impeller to an axial direction.

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A fan unit comprising a housing, a radial flow impeller arranged within said housing to be driven by a motor, so as to draw in a gaseous medium which is expelled from the impeller in a radial indirection, and a guide radially enclosing and adjacent to the impeller, the guide being mounted inside the

A fan unit comprising a housing, a radial flow impeller arranged within said housing to be driven by a motor, so as to draw in a gaseous medium which is expelled from the impeller in a radial indirection, and a guide radially enclosing and adjacent to the impeller, the guide being mounted inside the housing which is of substantially uniform cross-section, and having a plurality of axially extending blades arranged to direct the medium flow emerging from the impeller into an axial direction, the guide blades being inclined in a circumferential direction in relation to the axis of rotation of the impeller, and each guide blade having an arcuate profile, in radial section, extending axially beyond blades of the impeller at both ends thereof and having its radially outer edge in proximity or adjacent to said housing.