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Superior Clay Corporation
Superior Clay Flue Liners & Flue Rings
Fireplace Flue Liner
Superior Clay manufactures a complete line of vitrified clay flue liners from 3" to 36" diameters in round flue liners and from 4"x8" to 24"x24" in square and rectangular flue liners. Socket type joints and self aligning joints are available in round flue liners. Superior manufactures flues with holes, contoured flue rings, and flue tees. Flue rings are available in lengths from 4" to 18."

Flue sizes typically used in fireplaces

Superior Clay Flue Liner Dimensions

Rectangular Flue Lining

Round Flue Lining

Flue Lining with Opening
Outside Dimensions (Approx. In.) Effective Flue Area (Sq. In.) Normal Inside Diameter (In.) Effective Flue Area (Sq. In.) Flue Lining with Opening Size of Flue (In.) Size of Opening (In.)
4-1/2 x 8-1/2 23 4 12 8-1/2 x 8-1/2 6-1/2
4-1/2 x 13 34 5 19 8-1/2 x 13 8 or 10
8 x 8 42 6 28 13 x 13 10
8-1/2 x 8-1/2 49 7 38 8 x 8 6-1/2
8 x 12 67 8 50 8 x 12 8 or 9
8-1/2 x 13 76 9 64 12 x 12 10
8-1/2 x 18 102 10 79
Flue Ring Tees and Flue Tee Sizes correspond to those regular flue and flue rings.
12 x 12 102 12 113
12 x 16 131 15 177
13 x 13 127 18 255
13 x 18 173 21 346
16 x 16 181 24 452
16 x 20 222 27 530
18 x 18 233 30 706
20 x 20 298 33 829
20 x 24 335 36 989
24 x 24 431

Superior Clay Standard Flue Ring Sizes
4 x 4 5 x 4 6 x 4 7 x 4 8 x 4 9 x 4 10 x 4 12 x 4
3 x 6 4 x 6 5 x 6 6 x 6 7 x 6 8 x 6 9 x 6 10 x 6 12 x 6
4 x 9 5 x 9 6 x 9 7 x 9 8 x 9 9 x 9 10 x 9 12 x 9
3 x 12 4 x 12 5 x 12 6 x 12 7 x 12 8 x 12 9 x 12 10 x 12 12 x 12
5 x 15 6 x 15 7 x 15 8 x 15
5 x 18 6 x 18 7 x 18 8 x 18 9 x 18 10 x 18 12 x 18