Perforated sheets with elongated or slotted holes are used for filtering or separating liquids or solids (e.g. wine and food industry). The arrangement of the holes on the sheet is not purely aesthetic but offers certain technical characteristics.
Hole pattern
APLL: when the elongated holes are staggered and parallel with the long side
APLC: when the elongated holes are staggered and parallel with the short side
PPLL: when the elongated holes are level and parallel with the long side
PPLC: when the elongated holes are level and parallel with the short side