HITZE CUBO 700, Operation And Installation Manual, Page: 12 / 30

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5.3 Chimney duct
The fireplace insert must be appropriately selected to match the cross section of the combustion gas duct (flue
pipe) and the height of the flue.
The cross-sectional area of the flue and of the combustion gas duct is calculated in accordance with the following
formula:
where:
F – cross-sectional area of the flue and of the combustion gas duct [m
2
];
Q – rated thermal input [kW];
h – the height of the chimney [m].
In accordance with the applicable provisions of law, the flue may not be smaller than 14x14cm or its diameter must
be 15cm. Inserts with a higher thermal input require a flue with a larger cross section. The cross section also
depends on the height of the chimney.
The fireplace should be connected to the combustion gas duct or the vertical duct in accordance with the applicable
national standards.
The chimney draught should be as follows:
- minimum draught – 6 ± 2 Pa;
- MEDIUM, RECOMMENDED DRAUGHT – 12 ± 2 Pa;
- maximum draught – 15 ± 2 Pa.
NOTE:
To ensure the correct functioning of the insert, there must be a correct chimney draught in the connector of the flue
pipe:

the insert will not function properly if the chimney draught is not sufficient, resulting in excessive soot
deposits on the glass and in combustion gas ducts and reducing the total thermal power of the insert (due to
which combustion gases may escape to the room);

if the draught is too strong, the burning process may be too intense, causing high consumption of fuel and
resulting in permanent damage of the insert.
The chimney should be regularly inspected by a chimney sweep company.
5.3.1 Connection of the chimney ducts:

before installing the fireplace insert, the chimney ducts and its technical parameters and condition must be
inspected and approved by a chimney expert;

the fireplace insert may be only installed after the flue pipe has been inspected and approved by a chimney
expert.
The chimney duct must satisfy the applicable national or European standards.