Abstract: The plastic foundation vent embodying the invention comprises a plastic body with an integral peripheral rectangular wall surrounding the plastic body and defining opposed long sides and opposed short sides, an integral peripheral flange extends outwardly from the peripheral wall. A central integral screen portion having openings for bending and prevention of entry of animals and the like is provided within the peripheral wall. The peripheral flange has a front surface and a rear surface. A first groove is provided on the rear surface of one of the flanges alongside to define a live hinge line permitting the flange to be bent backwardly and forwardly.