Round Holes
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60
0
STAGGERED
Millimetre system pich 'F' in MM and Hole Dia.Also in MM.
Holes per SQ. Inch =
745
F
2
% Open Area =
% Open Area = 0.122 x Hole per SQ. Inch x d
2
OR
% Open Area =
90.7 X
(d/F)
2
STRAIGHT
Straight Pattern
Holes per SQ. Inch =
645
F
2
% Open Area = 0.122 x Hole per SQ. Inch x d
2
45
0
STAGGERED
45
0
Staggered
Holes per SQ. Inch =
645
P
2
% Open Area = 0.122 x Hole per SQ. Inch x d
2
PERFORATION PATTERN
1) 60
0
Staggered Far Apart
2) Straight
3) 60
0
Staggered Close
4) 45
0
Staggered Far Apart
5) 45
0
Staggered Close
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