An electronic device enclosure for suppressing Electro-Magnetic Interference (EMI) includes a first plate defined on a first plane, a second plate defined on a second plane and a number of polygonal holes defined in the first plate at an angle of orientation. The second plane is substantially perpendicular to the first plane. The angle of orientation of the number of polygonal holes in the first plate is set according to a number of maximum dimensions in a direction substantially perpendicular to the second plane. The angle of orientation is defined such that there are a minimum number of maximum dimensions.