Dal Zotto STEFY Manual Usuario página 41

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exAMpLeS OF cOrrect cOnnectiOn tO tHe cHiMney
Protection from rain
it is mandatory to use airtight pipes.
chimney
In addition to the general requirements, the chimneys for releasing combustion products into the atmosphere must:
Š operate under negative pressure (operation under positive pressure is not allowed);
Š have a preferably circular internal section; square or rectangular sections must have rounded corners with a radius of no
less than 20 mm (hydraulically equivalent sections may be used, as long as the ratio between the longer side and the shorter
side of the rectangle, which circumscribes the section, is in any case no greater than 1.5);
Š be designed for fumes be designed for fumes expulsion;
Š be predominantly vertical and have no narrowing along their entire length;
Š have no more than two direction changes with a slope angle no greater than 45°;
Š be fitted with, in the event of operating in damp conditions, a device for reflux drainage (condensation, rainwater);
Ducted system
a ducted system can be installed with one or more ducts, operating only with negative pressure with respect to the environment.
The flexible hose compliant with UNI EN 1856-2, with T400-G characteristics, meets the requirements.
chimney caps
The chimney caps must meet the following requirements:
Š they must have a useful outlet section no less than double of that of the chimney/ducted system on which it is installed;
Š they must be adapted in order to prevent the penetration of rain and snow in the chimney/ducted system;
Š they must be built so that, in the event of winds coming from all directions and from any angle, the expulsion of combustion
products is in any case ensured;
Š they must be free from mechanical intake aids.
and wind
"T" fitting with
inspection
plug
Steel plate,
airtight
engLiSH
Protection from rain
and wind
Max 3 mt
3 - 5%
"T" fitting with
inspection plug
Insulated "T"
fitting with
inspection plug
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