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Chemical Resistant Brick: 8 " Series Key Brick Unit Requirements

8 x 3-3/4 x 2-1/4 INCH KEY BRICK
Inside Diameter No. 4 Key No. 3 Key No. 2 Key No. 1 Key Strts. Total

1'6" 29 - - - - 29
2'0" 20 15 - - - 35
2'6" 10 30 - - - 40
3'0" - 44 - - - 44
3'6" - 34 16 - - 50
4'0" - 30 25 - - 55
4'6" - 19 41 - - 60
5'0" - 10 55 - - 65
5'3" - - 67 - - 67
5'6" - - 65 5 - 70

6'0" - - 60 15 - 75
6'6" - - 55 25 - 80
7'0" - - 50 35 - 85
7'6" - - 45 45 - 90
8'0" - - 40 55 - >95
8'6" - - 35 65 - 100
9'0" - - 30 75 - 105
9'6" - - 25 85 - 110
10'0" - - 20 95 - 115
10'6" - - 15 105 - 120

>11'0" - - >10 115 - 125
11'6" - - 5 125 - 130
12'0" - - - 135 - 135
12'6" - - - 135 5 140
13'0" - - - 135 10 145
13'6" - - - 135 15 150
14'0" - - - 135 20 155
14'6" - - - 135 25 160
15'0" - - - 135 30 165
15'6" - - - 135 35 170

16'0" - - - 135 40 175
16'6" - - - 135 45 180
17'0" - - - 135 50 185
17'6" - - - 135 55 190
18'0" - - - 135 60 195
18'6" - - - 135 65 200
19'0" - - - 135 70 205
19'6" - - - 135 75 210

20'0" - - - 135 80 215
20'6" - - - 135 85 220
21'0" - - - 135 90 225
21'6" - - - 135 95 230
22'0" - - - 135 100 235
22'6" - - - 135 105 240
23'0" - - - 135 110 245
23'6" - - - 135 115 250
24'0" - - - 135 120 255
24'6" - - - 135 125 260
25'0" - - - 135 130 265