Patent ID: 8403171

Claim:
An enclosure, comprising: a bottom panel; and a side panel extending from the bottom panel, the side panel being substantially perpendicular to the bottom panel, the side panel having a plurality of openings substantially arranged in a line, each opening is rectangular, a flange surrounding each opening, a cross section of the flange comprising a first side portion, a bent portion extending from the first side portion, and a second side portion, wherein an angle defined by the second side portion and the side panel is larger than about 90 degrees; the flange enhances the structural integrity of the side panel if force is applied on the side panel in a direction parallel to the side panel; wherein the bent portion comprises a first arced portion, a connecting portion extending from the first arced portion, and a second arced portion extending from the connecting portion; the first arced portion is connected to the first side portion, and the second arced portion is connected to the second side portion; the first arced portion is tangent to the connecting portion, and the second arced portion is tangent to the connecting portion and the second side portion.