Closed flue chimney inserts - a modern heating concept
Closed flue chimney inserts
In recent times, an increasing number of new houses are being surrounded by virtually airtight building envelopes in order to save energy. This means that an ever greater number of closed flue chimney inserts are required. Many of these 'low-energy houses' have controlled ventilation systems to provide sufficient ventilation. This draw fresh air into a few rooms, and extract air from other rooms, but this does not eliminate the risk of creating a vacuum, i.e. negative pressure. To prevent the escape of gases, even into a negative pressure environment, closed flue chimney inserts need to be particularly well sealed, and must also be equipped with ultra-tight closing doors. To enable a chimney insert to operate in an closed flue manner, it requires a special connection journal which assures access to external air instead of interior room air during the combustion process.
Where closed flue chimney inserts should best be installed
Especially in low-energy houses and 'passive houses', i.e. residential accommodation in which closed flue chimney inserts should be preferred over other heating variants. These are precisely the houses most likely to be equipped with such an airtight external envelope that the amount of energy required to keep the apartments and the entire building heated is very low. It is therefore existentially critical in houses of this kind to assure proper ventilation. Otherwise, you run the risk of rapidly encountering damage caused by humidity, e.g. persistent and destructive mould. Accordingly, in houses of this kind, controlled ventilation systems should provide a continuous exchange of air. In these cases, closed flue chimney inserts avoid the risk of creating negative pressure, which would otherwise occur as room air is drawn out, and which in turn would cause hazardous flue gases to be drawn into the room. Summary: closed flue chimney inserts are the most suitable answer to the requirements of passive and low-energy houses.