Patent ID: 7290981
Filing Date: 2007-11-06
Classification: F04D

Abstract:
1. A powered vent fan comprising: an impeller with a vane that is rotated around an axis; a housing defining an inlet, an outlet and an internal space through which a fluid moves along a flow path between the inlet and outlet; a separating wall dividing the internal space so as to define an inlet chamber and an outlet chamber; a first passageway communicating between the inlet chamber and the outlet chamber, the inlet spaced radially from the first passageway, the fluid in the flow path moving from the inlet radially to and through the inlet chamber towards the first passageway, axially from the inlet chamber to the first passageway, from the first passageway to the outlet chamber and to and from the outlet; at least one fin residing in the inlet chamber and situated to intercept fluid adjacent to the inlet, and directing the fluid flow from the inlet towards the first passageway; a first baffle surface extending transversely to the flow path and blocking passage of the fluid at the inlet into the outlet chamber; and a second baffle surface extending transversely to the flow path and blocking passage of the fluid at the outlet back into the inlet chamber.