Hole Patterns (Finished/Unfinished)

Tech. Info

Formula for Determining Percentage of Open Areas

To Find the Holes Per Square Inch
 
% Open Area  = H.P.S.I
White Rule
78.54 X D2
D2 X 90.69  = %
White Rule
C2
D2 X 78.54  = %
White Rule
C2
S2 X 100  = %
White Rule
C2
L X W  X 100 = %
White 
Rule
C2
157.08 D2  = %
White 
Rule
S2
100 X D2  = %
White Rule
C2

Hole Patterns