12 Phenix green
C1
C2
C2
A
D1
C2 + D2
Combustion/Convection with fan: summary
The following is an example of an outside connection with a fan, with two hot air vents coupled at
the decompression air exit and with grilles.
This isn’t the only way to connect the fi replace, but is one of the optimal confi gurations.
Front
view
Side
view
In all possible confi gurations, it is essential to comply with the minimum sizes for each of the three
air fl ows (combustion, convection and decompression).
Entry
Exit
Minimum size*
Combustion
A
120 cm²
Convection
C1
C2
400 cm²
Decompression
D1
D2
200 cm²
When the air in the room is used for combustion, it is recommended that separate entries be used
and the combustion air channelled (fl exible or PVC pipe) to ensure that the ventilation does not in-
terfere with combustion.
* The minimum sizes shown above are valid for completely open passageways. When a grille or a
fi lter is placed on the opening (at entry or exit), the area of the entry or exit point must be increased
proportionally with the permeability coeffi cient of the grille (or fi lter). For example, the 400 cm² re-
quired for convection increase to 600 cm² with a standard grille (permeability coeffi cient of 2/3 or
66%).
