Combustion air network
Combustion air network (also room air network ) is an air network of rooms, which ensures the air supply of room air- dependent gas devices via external joints. The combustion air network of rooms is necessary if the minimum combustion chamber volume determined from the room performance ratio (RLV) does not correspond to the room volume of the room in which the gas boiler is installed.
The combustion air network is created by connecting as many rooms with door slits provided with grids until a minimum combustion chamber air volume is reached. Instead of using door grilles, it is also possible to shorten the door leaves by 1 or 1.5 cm or to remove the door seals. However, with this approach it must be ensured that the additional combustion chamber volume produced in this way cannot be fully taken into account.
Because high heat outputs require a lot of air , the room where the gas appliances are installed are generally insufficient to continuously supply them with the fresh air they need. Protection goal 2 in particular is rarely met, which is why so many rooms have to be connected to the outside with windows and / or doors until the minimum combustion chamber volume is reached. The grid size is 150 cm² per door.
The boiler ventilation for the fulfillment of the protection objective 1 can also be prepared with corridors and rooms without external joints because the currently existing supply of fresh air in the starting ensure the combustion needs. The grille size is 300 cm² per door, divided into two grids of 150 cm².
According to the sketch, a distinction is made between indirect and direct combustion air connections.
So that the fresh air drawn in can supply the gas appliance, the door slots must not be glued or covered, e.g. B. because the possible draft bothers the residents.