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Round Flue Liners (Below)

Square/Rectangular Flue Liners

 [US Units] [SI Units]

Size

Outside Dim

Inside Dim

Inside Cross Sectional Area (in2)

Wall Thicknes s

47.3 in²

8"x 8"*

7 ⁷/8"x 7 ⁷/8"

6 ⁷/8"x 6 ⁷/8"

⁵/8"

49.0 in²

8¹/2"x 8¹/2"

8 ¹/2"x 8 ¹/2"

7"x7"

³/4"

60.0 in²

8"x 12”*

7 ¹/2"x 11¹/2"

6"x 10"

³/4"

71.5 in²

8 ¹/2"x 13"

8 ¹/2"x 13"

6 ¹/2"x 11"

1"

70.1 in²

10"x 10"

10"x 10"

8 ³/8"x 8 ³/8"

1"

95.1 in²

12"x 12”*

11¹/2"x 11¹/2"

9 ³/4"x 9 ³/4"

³/4"

121.0 in²

13"x 13"

12¹/2"x 12¹/2"

11"x 11"

³/4"

120.3 in²

11 ¹/2"x 15 ¹/2"*

11¹/2"x 15¹/2"

9 ¹/4"x 13"

1 ¹/4"

166.6 in²

13"x 18"

13"x 17 ¹/2"

10³/4"x15¹/2"

1"

175.2 in²

15 ¹/2"x 15 ¹/2"*

15"x 15 ¹/2"

13"x 13 ¹/4"

1"

225.0 in²

18"x 18"

17 ¹/2"x17¹/2"

15"x 15"

1 ¹/4"

221.0 in²

16"x 20"

15¹/2"x 19¹/4"

13"x 17"

1 ¹/4"

272.3 in²

20"x 20"

19¹/4"x 19¹/4"

16¹/2"x16¹/2"

1 ³/8"

329.2 in²

20"x 24"

19 ¹/2"x 23"

16¹/4"x20¹/4"

1 ⁵/8"

420.3 in²

24"x 24"

24"x 24"

20¹/2"x20¹/2"

1 ³/4"

*Designates modular flue sizes.  Modular flues are designed for use with modular brick sizes.  Non-modular flue liners are designed for standard size brick.  As a general rule, modular flues should be used whenever possible because they make construction easier and less costly.

Round Flue Liners

Size

Outside Diameter

Inside Diameter

Inside cross-sectional Area

Wall Thickness

4" Round

5 1/4"

4"

12.6 in²

5/8"

6" Round

7 1/2"

6"

28.3 in²

3/4"

7" Round

8 3/4"

7"

38.5 in²

7/8"

8" Round

10"

8"

50.3 in²

1"

10" Round

12"

10"

78.5 in²

1"

12"

12" Round

14"

113.0 in²

1"

15"

15" Round*

"

176.7 in²

"

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