Goodman GMP - Page 36

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Masonry Chimney Liner Dimensions
TABLE 9 With Circular Equivalents
Nominal Liner
Size - Inches
Inside Dimensions In
Liner - Inches
Inside Diameter or Equivalent
Diameter - Inches
Equivalent Area
Square Inches
4 x 8 2 1/2 x 6 1/2 4
5
6
7
12.2
19.6
28.3
38.3
8 x 8 6 3/4 x 6 3/4 7.4
8
42.7
50.3
8 x 12 6 1/2 x 10 1/2 9
10
63.6
78.5
12 x 12 9 3/4 x 9 3/4 10.4
11
83.3
95
12 x 16 9 1/2 x 13 1/2 11.8
12
14
107.5
113
153.9
16 x 16 13 1/4 x 13 1/4 14.5
15
162.9
176.7
16 x 20 13 x 17 16.2
18
206.1
254.4
20 x 20 16 3/4 x 16 3/4 18.2
20
260.2
314.1
20 x 24 16 1/2 x 20 1/2 20.1
22
314.2
380.1
When liner sizes differ dimensionally from those shown in Table 9 equivalent diameters may be from published tables
for square and rectangular ducts of equivalent carrying capacity or by other engineering methods.