SI Units

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Square/Rectangular Flue Liners

Round Flue Liners (Below)

Size (mm)

Outside Dim (mm)

Inside Dim (mm)

Inside cross-section al Area (cm2)

Wall Thicknes s (mm)

8"x8" (203x203)*

200x200

175x175

305 cm²

16 mm

8½"x8½"
(216x216)

216x216

178x178

316 cm²

19 mm

8"x12" (203x305)*

191x292

152x254

387 cm²

19 mm

8½"x13"
(216x330)

216x330

165x279

461 cm²

25 mm

10"x10" (254x254)

254x254

210x210

441 cm²

22 mm

12"x12"
(305x305)*

318x318

248x248

614 cm²

19 mm

13"x13" (330x330)

292x394

279x279

781 cm²

19 mm

11½"x15½"
(292x394)*

330x445

235x330

776 cm²

32 mm

13"x18" (330x457)

381x394

273x394

1075 cm²

25 mm

15½"x15½"
(394x394)*

381x394

330x337

1130 cm²

25 mm

18"x18" (457x457)

445x445

381x381

1452 cm2

32 mm

16"x20" (406x508)

381x489

330x432

1426 cm²

32 mm

20"x20" (508x508)

489x489

419x419

1757 cm²

35 mm

20"x24" (508x610)

495x584

413x514

2123 cm²

41 mm

24"x24" (610x610)

610x610

521x521

2712 cm²

44 mm

*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 (mm)

Outside Dim (mm)

Inside Diameter (mm)

Inside cross-section al Area (cm²)

Wall Thickness (mm)

4" Round (102 mm)

133 mm

102 mm

81 cm²

16 mm

6" Round (152 mm)

190 mm

152 mm

182 cm²

19 mm

7" Round (178 mm)

222 mm

178 mm

248 cm²

22 mm

8" Round (203 mm)

254 mm

203 mm

325 cm²

25 mm

10" Round (254 mm)

305 mm

254 mm

506 cm²

25 mm

12" Round (305 mm)

356 mm

305 mm

729 cm²

25 mm

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