7
5.5.
SMOKE EXTRACTION
- The tubes to be used for smoke extraction must be rigid, made of aluminum sheet (at least 1.5 mm thick wall) or stainless
steel (at least 0.5 mm thick wall). For lengths up to 5m, use pipes of 80mm diameter, with seals, and for lengths greater than 5m,
pipes of 100mm diameter, with seals.
- It is advisable to insulate the pipes with insulating material (with a mineral wool of at least 2 cm thickness), or use steel
pipes with a double wall, where the first vertical part, if it is internal, does not have to have double layer.
- It is mandatory that the first vertical part has a length of at least 1.5 meters in order to guarantee proper smoke extraction.
- It is advised to make at most 5 to 6 changes of direction using knees of 45-90
˚
or T joints.
- Always use T joints with inspection openings for each horizontal or vertical change of direction of the flue pipe.
- Horizontal parts must not have a length greater than 2-3 m, with an inclination of at least 5%.
- Anchor pipes to walls.
Flue pipes MUST NOT BE CONNECTED:
- To a chimney used by other smoke generators (furnaces, fireplaces, etc.)
- To the air extraction system (aspirators, valves, etc.) even if it is connected by pipes.
It is forbidden to install valves for preventing the draft.
In case of length of the flue pipe greater than 5 meters or in the conditions of poor airflow (the presence of many curves,
inadequate ending of the outlet, etc.), the extraction of smoke might be inappropriate. In this case, it will be necessary to
change the operating parameters (extraction of smoke and feeding pellets) in order to adjust the cooker to the actual
characteristics of the chimney.
Contact technical support.
5.5.1 Smoke extraction through the roof chimney
The smoke extraction chimney must be constructed in compliance with the regulations, both in terms of dimensions and in
terms of materials used for its construction.
RUINED chimneys, made of inadequate material (fibrous cement, galvanized steel, etc... whose interior is not smooth and
porous) are inadequate and may impact proper operations of the cooker.
Smoke extraction through a traditional chimney (Figures 7 and 8) can be executed only if the following rules are observed:
- Check the condition of the chimney - in the case of an old chimney, its repair is advised by introducing a properly insulated
steel tube (mineral wool, vermiculite).
- Smoke can be taken directly into the chimney equipped with an inspection opening.
The smoke extraction system (chimney) made of metal pipes must be grounded in accordance with existing standards and
legal regulations.
This grounding must be independent of the cooker’s grounding.
When installing the flue pipes start with T-
branch (2), to which a condensate vessel with an outlet
for condensate (1) is mounted. Then install a flue pipe
(3) and penetrate the wall with an 90° elbow (4).
