Patent attributes
A duct fan comprises a housing (4) having substantially the shape of a rectangular parallelepiped and inside thereof an impeller (5) and a motor for rotation thereof. The fan has also a member for connecting an inlet side of the housing to an upstream duct part for sucking air in therefrom and a member for connecting an outlet side of the housing to a downstream duct part for exhausting air thereto. The impeller is a radial impeller having the axis of rotation substantially perpendicular to the direction of the main transport of air from the inlet to the outlet. The outlet connecting member is designed to define an airflow path tapering substantially conically in the outlet towards the end of that member adapted to adjoin to a said downstream duct part.
