Thermasis HYDRA 12, Инструкция по установке и эксплуатации

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CHIMNEY STACK
The chimney stack is a device fitted on the top of
the chimney that is designed to
aid dispersion of the products of combustion in the
atmosphere.
The chimney stack must comply with the following
requirements:

it must have an internal section and shape
the same as the flue (A);

it must have a useful outlet section (B) of
not less than twice that of the flue (A);

the part of the chimney that emerges from
the roof or remains in contact with the
outside (e.g. in the case of a flat roof), must
be covered with brick or tile elements and
in any case well insulated;

it must be built in such a way as to prevent
the penetration of rain, snow and foreign
matter into the flue and to ensure that in
the event of winds from all directions and
angle, discharge of the combustion
products is assured (chimney stack with
down-draught cowl).