perforated metal open area calculation
Formulas for Determining Percentage of Open Area
In each formula “D” = hole diameter and “C” = center spacing
Round Hole Staggered Pattern (60°)
Dia2
Center2
x
90.5
=
Percentage of Open Area
Round Hole Straight
Line Pattern (90°)
Dia2
Center2
x
78.54
=
Percentage of Open Area
Round Hole Diagonal
Pattern (45°)
Dia2
Center2
x
157.08
=
Percentage of Open Area
