STANDARD PERFORATION PATTERNS Perforations Open Area: 11% Pattern: Square 1/4” (.250”) x 3/4” (.750”) Straight Centers Open Area: 14% Pattern: Square 3/8” (.375”) x 1” (1.000”) Straight Centers Open Area: 13% Open Area: 71% Pattern: Square 1/2” (.500”) x 19/32” (.594”) Straight Centers Meets NFPA Code 13 - 8.15.13 Open-Grid Ceilings S14-34ST11 S38-10ST14 S12-1932ST71 Open Area: 41% Pattern: Square 7/16” (.438”) x 11/16” (.688”) Basket Weave
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