Abstract: A vent and baffle used to provide an air passage between the soffit and the attic of a house to insure the flow of air through the attic. The vent is an elongated arcuate member having outwardly directed flanges adapted to be secured to the roof boards of a structure with suitable fasteners. A first baffle is a block having a semi-circular recess to accommodate and support the one end of the vent againt the roof boards. The baffle is located in a tight fit or wedged relationship with the roof boards, adjacent roof rafters, and top plate of the structure to block the passage below the vent between the attic and the soffit and insulate the area above the top plate of the side wall of the structure. A second baffle is used without the vent to block the entire space above the top plate between adjacent roof rafters. The vent and baffles are made from a foamed plastic having flame resistant additives.