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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