Patent ID: 11994145

Abstract:
Disclosed is an Air Handling Unit, AHU, including a fan inducing a flow in an air ventilation ducting system. The fan includes a front disc, a back plate and fan blades manufactured as separate units. The fan provides a radial or mixed flow. The fan blades have an upper edge including upper attachment protrusions attached to the front disc and a lower edge including lower attachment protrusions attached to the back plate. The fan blade includes at least two upper and lower attachment protrusions protruding through the front disc and back plate indentations, respectively, forming axial retainers. An axial locker on the protruding portion provides a retaining axial force between the front disc and the back plate. The fan further includes another other upper and lower attachment protrusion cooperating with front disc and back plate indentations, respectively, forming radial retainers preventing the blades from dislocating in the radial direction.