Cover types: for STM 180 casing, STR 180 casing, STR 220 casing, and for the HELIOS chimney system. Protects the chimney against the weather.

Acid-resistant ceramic inner tube, the central element of the chimney.
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Outer casing of fired red clay, STM type, for chimney systems.
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Outer casing of fired red clay, STR type, for chimney systems.
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Refractory outer casing of fired clay, STM type, for chimney systems.
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