Standard Perforated Patterns

Perforation	Open Area (%)	H.P.S.I.	IPA #	PDF Drawing
.020 x .043 REV	20%	624.5	100
.026 x .040 STG	38%	721.7
.029 x .109 REV	6%	97.2
.033 x .055 STR	28%	330.6	103
.034 x .250 REV	2%	18.5
.040 x .059 STG	42%	331.7
.040 x .063 STR	32%	252.0
.040 x .066 STR	29%	229.6	104
.040 x .088 STG	19%	149.1
.045 x .066 STR	37%	229.6	105
.045 x .088 STG	24%	149.1
.050 x .141 REV	11%	58.1
.050 x .188 STG REV	6%	32.7
.052 x . 437 DIAG	1%	5.2
.062 x .093 STG	40%	133.5
.063 x .094 STG	41%	130.7
.063 x .125 STG	23%	73.9	106
.066 x .093 STG	46%	133.5
.066 x .125 STG	25%	73.9	106
.075 x .100 STG	51%	115.5
.078 x .109 STG	46%	97.2	107
.078 x .125 STG	35%	73.9	108
.078 x .250 STG	9%	18.5
.079 x .098 STG	59%	120.2
.093 x .156 STG	32%	47.4	109
.093 x .188 DIAG	19%	28.3
.093 x .188 REV	22%	32.7
.093 x .188 STG	22%	32.7	110
.093 x .250 REV	13%	18.5
.094 x .156 REV	33%	47.4	110
.094 x .250 STG	13%	18.5	111
.109 x .188 STG	30%	32.7
.125 x .188 STG	40%	32.7	113
.125 x .218 STG	30%	24.3	114
.125 x .250 DIAG	20%	16.0
.125 x .250 REV	23%	18.5
.125 x .250 STG	23%	18.5	115
.125 x .250 STR	20%	16.0
.125 x .500 STG	6%	4.6
.127 x .188 STG	41%	32.7	113
.127 x .218 STG	31%	24.3	114
.127 x .250 STG	23%	18.5	115
.156 x .188 STG	62%	32.7
.156 x .218 STG	47%	24.3	116
.156 x .250 REV	35%	18.5
.156 x .312 STR	20%	10.3
.157 x .188 STG	63%	32.7
.157 x .218 STG	47%	24.3	116
.157 x .250 STG	36%	18.5	117
.187 x .250 REV	51%	18.5
.187 x .250 STG	51%	18.5	118
.187 x .312 STG	33%	11.9	119
.187 x .437 REV	17%	6.0
.188 x .250 STG	51%	18.5	118
.188 x .312 STG	33%	11.9	119
.188 x .375 REV	23%	8.2
.188 x .375 STG	23%	8.2
.191 x .296 STG	38%	13.2
.191 x .312 STG	34%	11.9
.191 x .375 STG	24	8.2
.250 x .312 STG	58%	11.9	120
.250 x .375 STG	40%	8.2	121
.250 X .375 STG REV	40%	8.2
.250 x .438 STG	30%	6.0	122
.250 x .500 STG	223%	4.6	123
.312 x .437 STG	46%	6.0
.375 x .191 STG	51%	4.6
.375 x .563 STG	40%	3.6	125
.375 x .625 STG	33%	3.0	126
.500 x .688 STG	48%	2.4	128
.625 x .875 STG	46%	1.5