Patent ID: 8622220

Claim:
A device, comprising: a panel having a feed end, an exit end, and two laterally spaced-apart sides extending between said feed end and said exit end, said panel comprising: a plurality of first openings having a first shape and being arranged in a pattern on said panel, said pattern comprising a first group of said first openings that is positioned adjacent to said feed end and two second groups of said first openings that are positioned adjacent to each of a respective one of said two laterally spaced-apart sides, wherein said first group of said first openings extends substantially from said feed end to a first distance from said feed end and at least one of said two second groups of said first openings extends substantially from said first distance to at least a second distance from said feed end that is greater than said first distance; and a plurality of second openings having a second shape that is different from said first shape, wherein a group of said second openings is positioned between said first group of said first openings and said exit end, and at least some of said second openings comprising said group of said second openings are positioned between each of said two second groups of said first openings.