Cooktop ventilation system having a dual direction flow blower/fan

A domestic ventilation system for providing ventilation of a domestic cooking appliance, comprising:

• a domestic ventilation appliance including a housing having at least a first opening and a second opening, the first opening for capturing exhaust air from the domestic cooking appliance and the second opening for permitting secondary air to exit an interior of the housing to form an air curtain that enhances a capture ability of the domestic ventilation appliance to capture the exhaust air;
• a dual direction flow blower/fan configured both to convey the exhaust air through the housing from the first opening in a first direction and to convey the secondary air through the housing to the second opening in a second direction, the second direction being opposite the first direction, and
• a complex curve interior flow surface in the housing of the domestic ventilation appliance, the complex curve interior flow surface partitioning the interior of the housing for separately guiding the secondary air and the exhaust air through the housing, a first side of the complex curve interior flow surface configured to guide and smooth a flow of the secondary air conveyed by the dual direction flow blower/fan through the housing to the second opening.