A
B
D
60°
E
C
F
A
B
C
D
E
45°
F
13
2-INSTALLATION
Technical Dept. - All rights reserved - Reproduction is prohibited
ROOF AT 60° ROOF AT 45°
DIMENSIONING
The drop in pressure (draft) of a flue depends on its height. Check the drop in pressure with the values indicated in the technical
characteristics. The minimum height of the chimney is 3.5 meters.
The interior cross-section of the flue can be circular (best variation), square or rectangular (the ratio between the interior sides must be
≤1.5) with the sides joined with a minimum radius of 20 mm. The dimension of the cross-section must be
minimum Ø100mm
.
The cross sections/lengths of chimneys must be correctly sized in accordance with the general method of calculation of UNI EN13384-1 or
other proven efficiency methods.
Below is a list of some flues available on the market:
Steel chimney AISI 316 with
double chamber insulated
with ceramic fibre or equiva-
lent resistant up to 400°C.
Refractory chimney with
double insulated chamber and
external lightweight concrete
cladding with cellular material
such as clay.
Traditional square-section
clay chimney with insulating
empty inserts.
Avoid products with an
internal rectangular section
where the larger side is 1.5
times the smaller side (e.g.
20x40 or 15x30).
EXCELLENT
GOOD
POOR
VERY POOR
A = MIN. 2.60 metres
B = DISTANCE > 1.20 metres
C = DISTANCE < 1.20 metres
D = 0.50 metres ABOVE HIGHEST
POINT
E = 2.10 metres
F = REFLUX ZONE
A = MIN. 2.00 metres
B = DISTANCE > 1.30 metres
C = DISTANCE < 1.30 metres
D = 0.50 metres ABOVE HIGHEST
POINT
E = 1.50 metres
F = REFLUX ZONE
FIGURE 5
FIGURE 6
