Patent ID: 8448398

Claim:
A vent comprising: an outer element comprising, an outer perforated area comprising at least one perforation, a first wall extending from the outer perforated area, a second wall extending from the outer perforated area and spaced apart from the first wall; a first flange extending from the first wall, a second flange extending from the second wall in a direction opposite the first flange, a third wall extending from the outer perforated area to the first wall, and a fourth wall extending from the outer perforated area to the second wall, wherein the outer perforated area, the first wall, the second wall, the third wall, the fourth wall, the first flange and the second flange are integrally formed from a single piece of material, wherein said single piece of material is bent proximate opposite ends of the outer perforated area in at least a direction away from said outer perforated area to define the third wall and the fourth wall spaced apart from the third wall and extending from the outer perforated area in at least a direction away from said outer perforated area, and wherein said single piece of material is bent again at different locations to define said first wall extending from said third wall and said second wall extending from said fourth wall, wherein said first and second walls extend in at least a direction toward and beyond said outer perforated area, and wherein said single piece of material is bent again at different locations to form the first flange extending from said first wall and the second flange extending from said second wall and opposite said first flange; and an inner element comprising at least one perforation and a peripheral portion, wherein the inner element is coupled to the first and second walls and separated from the outer element by a distance to define a plenum between the outer element and the inner element.