Fan tray perforation pattern

An apparatus, comprising:

• a plate comprising a plurality of perforations arranged in concentric circles centered at a point, wherein each of the perforations is a closed shape comprising four edges that are tangential to a hypothetical circle located inside the perforation, wherein two opposite edges of each perforation comprise non-parallel straight lines, and two other opposite edges comprise curved lines.

A method, comprising:

• generating a pattern on a planar surface, the pattern comprising a plurality of perforations arranged in concentric circles centered at a point, wherein each of the perforations is a closed shape comprising four edges that are tangential to a hypothetical circle located inside the perforation, wherein two opposite edges of each perforation comprise non-parallel straight lines, and two other opposite edges comprise curved lines;
• and
• cutting out the plurality of perforations.