Ceramic Chimney Pots, Architectural Ornaments & Other Constructional Goods

The classification depends on the article's form and function. Chimney liners that are essentially tubular conduits designed to line a flue and convey combustion gases may be classified under heading 6906 as ceramic pipes or conduits. Chimney pots and cowls — the terminal decorative and functional caps placed at the top of a chimney stack — are specifically named in heading 6905.90. When in doubt, the article's primary function (gas conveyance versus chimney termination/ornamentation) and its physical form guide the classification.

As with heading 6904, the heat-insulating designation for goods under 6905900010 is supported by manufacturer-issued thermal conductivity data or product specifications confirming a porous, low-density ceramic structure. Importers should retain technical data sheets from the foreign manufacturer showing thermal performance characteristics, as CBP may request this documentation to verify the correct 10-digit line selection between 6905900010 and 6905900050.