In the chimneys there was applied a ventilation duct made of ABS plastic with a filling (polyurethane foam). The duct walls are about 30 mm thick depending on the diameter and the total height of the chimney.
The basic segment of the ventilation duct is 1000mm long and can be extended by maximum 5 elements (each one 1000mm long).
With every type of the chimney there is a possibillity to attach underneath a bowl which additionally secures the structure from light and intense precipitation while the valves are open.
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