Interior duct for chimneys, resistant to the corrosive agents resulting from combustion. Central element, resistant to temperature and acid condensate.

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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Refractory outer casing of fired clay, STR type, for chimney systems.
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