A
B
B
A
C
D
B
12
3-FLUE
EXTERNAL AIR INLET
It is mandatory to provide an adequate external air inlet that supplies the combustion air required for the product to work properly. The
flow of air between the outside and the installation room may be direct, through an inlet in an external wall of the room (preferable
solution see Figure 9 c); or indirect, via air intake from adjoining rooms and connecting permanently with the installation room (see Figure
9 a/b). Adjoining areas may not include sleeping areas, garages or general areas with a fire hazard. During installation one must check the
minimum clearances required for air intake from outside. Take into account the presence of doors and windows that could interfere with
the proper flow of air to the product (see diagram below).
The air inlet must have a minimum total net area of 180 cm2 (for fireplaces/inserts): the surface must be increased accordingly if within
the room there are other active generators (for example: electric fan for stale air extraction, cook ranger hood, other stoves, etc...), which
could cause a depression in the room. One must verify that, with all the equipment on, the pressure drop between the room and the
outside does not exceed a value of 4 Pa. If necessary increase the intake section of the air inlet, which must be made at floor level and
always protected with a bird-proof outer protection grid and in such a way that it cannot be obstructed by any object.
You can connect the air required for combustion directly to the external air inlet, with a non-compressible pipe (e.g. spiral). For air ducts
up to 3 m, increase the cross-section by approximately 5%, longer ducts increase it by 15%.
FIGURE 9 c - directly from outside
A=INTERNAL AIR INLET
B=ROOM TO BE VENTILATED
C=INCREASE OF THE GAP UNDER THE DOOR
D=EXTERNAL AIR INLET
FIGURE 9 b - indirectly from the adjacent
room
FIGURE 9 a - indirectly from inside the room
