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CS.VTR.IST-1 / Rev 1.2
If the flue should be old or too big (internal diameter greater than 15 cm), duct the flue using a stainless steel pipe, properly insulated with rock wool or
vermiculite, and sized according to the route. The connection to the flue must be appropriately sealed.
When assembling the flue, there must be no more than 4 direction changes, including the initial T-shaped fitting.
Chimney
The chimney is a device crowning the flue, used to ease dispersion of combustion products.
It must satisfy the following requirements:
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It must have a usable outlet cross-section no less than double that of the flue onto which it is inserted;
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In must be shaped in such a way as to prevent rainwater or snow from seeping into the flue;
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It must be built in such a way as to ensure the discharge of combustion by-products even in the event of winds from every direction and inclination.
The outlet height (where height refers to the top of the flue, regardless of any chimney stacks) must be outside of the so-called reflux zone, in order to
prevent the formation of counter-pressures preventing the free discharge of combustion by-products into the atmosphere.
It is therefore necessary that the minimum heights - indicated in the following diagrams - are observed:
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