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16www.directmetals.com800.711.4939AIRPORT PARKING DECKSUNSCREENS20GA STEEL PEG BOARDFormulas for Determining Percentage of Open AreasIn each formula “D” = hole diameter and “C” = center spacing60˚ Staggered CentersPattern (Standard)Dia2Center2x90.5=Percentage of Open AreaStraight Line PatternDia2Center2x78.54=Percentage of Open Area45˚ StaggeredCenters PatternDia2Center2x157.08=Percentage of Open AreaSIGNAGEPATIO FURNITUREARCHITECTURAL BUILDING FASCIAPERFORATED METAL