A wall vent door assembly including a multi-functional hinge including flexible and resilient material extending continuously along the hinge edge of the door; one edge of the door is configured to accept and/or otherwise interface with a complimentary edge of the hinge material, and the adjacent hinge edge of the mounting frame is configured to accept and/or otherwise interface with another complimentary edge of the hinge material. Besides providing the hinge connection between the door and the adjacent frame, the flexible material also seals the interface to prevent entry of light and wind when the door is closed. The flexible and resilient hinge material also acts as a spring, exerting force to assist in the movement of the door from the closed position to open positions.