Hole
Dia.

60° Center
Spacing
% Open area Thick Mat'l Sample Size 30
MHz
100
MHz

300
MHz

1
GHz

2
GHz

4
GHz

6
GHz

8
GHz
10
GHz

12
GHz

14
GHz

16
GHz

18
GHz

.040 .055 48.00 .022 Alum. 24"x24" 70 70 80 56 55 48 57 35 48 44 42 41 42
.062 .093

40.00

.027 C.R.St'l 24"x24" 61 67 66 56 45 48 46 44 33 34 38 36 35
.062 .125 23.00 .025 Alum. 24"x24" 92 84 90 68 65 60 67 35 45 41 38 35 33
.072 .100 47.00 .038 C.R.St'l 24"x24" 64 70 90 62 55 52 40 33 37 34 33 29 27
.075 .125 32.70 .049 C.R.St'l 24"x24" 72 70 90 72 68 63 68 43 48 39 38 38 37
.078 .109 46.10 .027 C.R.St'l 24"x24" 66 75 72 63 55 54 45 41 39 28 24 21 28
.079 .115 42.80 .036 C.R.St'l 24"x24" 60 64 88 66 60 56 62 33 40 31 30 30 28
.100 .187 25.90 .040 Alum. 24"x24" 66 70 77 69 62 62 67 41 48 31 26 30 27
.125 .187 40.30 .030 Stainless 24"x24" 58 62 57 49 40 37 34 31 26 29 31 33 31
.125 .187 40.30 .030 Alum. 24"x24" 62 63 61 51 44 38 34 31 28 19 16 19 16
.125 .187 40.30 .060 Alum. 24"x24" 71 72 69 58 49 48 39 35 34 31 30 31 22
.125 .187 40.30 .125 Alum. 24"x24" 85 84 84 73 68 84 73 63 51 43 41 42 39
.156 .187 63.00 .057 C.R.St'l 24"x24" 57 58 59 48 40 35 31 29 26 19 16 13 11
.156 .250 35.40 .057 C.R.St'l 24"x24" 59 64 61 53 43 43 41 36 31 25 25 25 22
.187 .250 51.00 .027 C.R.St'l 24"x24" 52 52 49 37 31 24 21 19 18 18 21 18 16
.187 .250 51.00 .057 C.R.St'l 24"x24" 55 56 55 46 36 33 30 27 24 22 24 25 16

Shielding Effectiveness- % Attenuation

Hole
Dia.

60° Center
Spacing
% Open area Thick Mat'l Sample Size 30
MHz

100
MHz

300
MHz
1
GHz
2
GHz
4
GHz

6
GHz

8
GHz
10
GHz
12
GHz

14
GHz

16
GHz

18
GHz
.040 .055 48.00 .022 Allum. 24"x24" 99.97 99.97 99.99 99.84 99.82 99.60 99.86 99.22 99.60 99.4 99.2 99.1 99.2
.062 .093

40.00

.027 C.R.St'l 24"x24" 99.91 99.96 99.95 99.84 99.44 99.60 99.50 99.37 97.76 98 98.7 98.4 98.2
.062 .125 23.00 .025 Alum. 24"x24" 100.00 99.99 99.97 99.96 99.94 99.90 99.96 98.22 99.44 99.1 98.7 98.2 97.8
.072 .100 47.00 .038 C.R.St'l 24"x24" 99.94 99.97 99.97 99.92 99.82 99.75 99.00 97.76 98.59 98 97.8 96.5 95.5
.075 .125 32.70 .049 C.R.St'l 24"x24" 99.98 99.97 99.97 99.98 99.96 99.93 99.96 99.29 99.60 98.6 98.7 98.7 98.6
.078 .109 46.10 .027 C.R.St'l 24"x24" 99.95 99.98 99.98 99.93 99.82 99.80 99.44 99.11 98.88 96 93.7 91.1 96
.079 .115 42.80 .036 C.R.St'l 24"x24" 99.90 99.94 100.00 99.95 99.90 99.84 99.92 97.76 99.00 97.2 96.8 96.8 96
.100 .187 25.90 .040 Alum. 24"x24" 99.95 99.97 99.99 99.92 99.92 99.92 99.96 99.11 99.60 97.2 95 96.8 95.5
.125 .187 40.30 .030 Stainless 24"x24" 99.87 99.92 99.86 99.65 99.00 98.59 98.01 97.18 94.99 96.5 97.2 97.8 97.2
.125 .187 40.30 .030 Alum. 24"x24" 99.92 99.93 99.91 99.72 99.37 98.74 98.01 97.18 96.02 88.8 84.2 88.8 84.2
.125 .187 40.30 .060 Alum. 24"x24" 99.97 99.98 99.86 99.87 99.65 99.60 98.88 98.22 98.01 97.2 96.8 97.2 92.1
.125 .187 40.30 .125 Alum. 24"x24" 99.99 99.99 99.99 99.98 99.96 99.99 99.98 99.93 99.72 99.3 99.1 99.2 98.9
.156 .187 63.00 .057 C.R.St'l 24"x24" 99.86 99.87 99.89 99.60 99.00 98.22 97.16 96.45 94.99 88.8 84.2 77.6 71.8
.156 .250 35.40 .057 C.R.St'l 24"x24" 99.89 99.94 99.91 99.78 99.29 99.29 99.11 98.42 97.18 94.4 94.4 94.4 92.1
.187 .250 51.00 .027 C.R.St'l 24"x24" 99.75 99.75 99.65 98.59 97.18 93.69 91.09 88.78 88.78 87.4 91.1 87.4 84.2
.187 .250 51.00 .057 C.R.St'l 24"x24" 99.82 99.84 99.82 99.50 99.42 97.76 96.84 95.53 93.69 92.1 93.7 94.4 84.2