Formulas for Determining Open Area
Formulas for Determining Open Area
Formulas for Determining Open Area
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ROUND PERFORATIONS<br />
STAGGERED<br />
ROUND PERFORATIONS<br />
STRAIGHT LINE PATTERN<br />
ROUND PERFORATIONS<br />
45 DEGREE PATTERN<br />
Centers<br />
45°<br />
Standard Pattern Optional Pattern Optional Pattern<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
D<br />
2<br />
x 90.89<br />
Holes per Square Inch<br />
H.P.S.I. =<br />
= % D<br />
2<br />
x 90.89<br />
C 2<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
Holes per Square Inch<br />
H.P.S.I. =<br />
= % D<br />
2<br />
x 90.89<br />
C 2<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
Holes per Square Inch<br />
H.P.S.I. =<br />
C 2 = %<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
SQUARE PERFORATIONS<br />
STRAIGHT LINE<br />
SQUARE PERFORATIONS<br />
STAGGERED<br />
HEXAGON<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
Holes per Square Inch<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
Holes per Square Inch<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
S<br />
2<br />
x 100 = % S<br />
2<br />
x 100 = % S<br />
2<br />
x 100 = %<br />
C 2 C 2 C 2<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
Holes per Square Inch<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole
ROUND END SLOT<br />
SIDE STAGGER (SS)<br />
ROUND END SLOT<br />
SIDE STAGGER (SS)<br />
ROUND PERFORATIONS<br />
45 DEGREE PATTERN<br />
End Bar<br />
Slot<br />
Width<br />
Side<br />
Bar<br />
Slot Length<br />
End Bar<br />
Slot<br />
Width<br />
W<br />
Slot Length<br />
C L<br />
Side<br />
Bar<br />
Slot<br />
Width<br />
L<br />
End<br />
Bar<br />
W<br />
Slot Length<br />
C L<br />
Side<br />
Bar<br />
C W<br />
C W CW<br />
L<br />
C L<br />
L<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
WL-.215W 2 = % WL-.215W<br />
2 = % WL-.215W<br />
2<br />
= %<br />
C L C W C L C W C L C W<br />
Holes per Square Inch<br />
Holes per Square Inch<br />
Holes per Square Inch<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole<br />
C W<br />
SQUARE END SLOT<br />
C L<br />
<strong>Open</strong> <strong>Area</strong> Formula<br />
L x W<br />
C L C W<br />
x 100 = %<br />
Holes per Square Inch<br />
L<br />
W<br />
H.P.S.I. =<br />
% <strong>Open</strong> <strong>Area</strong><br />
<strong>Area</strong> of Hole
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