FOREVER® Stainless Steel Double Flue Bolt On Chimney Caps
8 x 28 fits flue sizes from 6.5″ x 25″ to 9″ x 28″ Fits over a double flue that has two 8 x13 flue tiles. 13 x 28 fits flue sizes from 11″ x 25″ to 14″ x 28″ Fits over a double flue that has two 13 x13 flue tiles.