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Square Holes

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STRAIGHT

Holes per Sq. Inch =

645

F²

% Open Area =

100. x²

F²

STAGGERED (CLOSE)

For Square Holes Having Radius

r = 0.15.x

<-- r = 0.15.x

% Open Area =	98.x²
	F²

STAGGERED (FAR APART)
	Diamond

Note:

Formula for Percentage Open Area & Holes per Square Inch
For all above patterns of Square & Diamond Perforation is common.

PERFORATION PATTERN

1) Staggered Parallel to Width Close
2) Staggered Parallel to Length Close
3) Straight
4) Diamond
5) Staggered Parallel to Width Far Apart
6) Staggered Parallel to Length