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Note:
(1) The terminals under a practicable balcony must be placed in
such a position that the total path of the fumes, from the point of
exit of the same from the terminal to their outlet from the external
perimeter of the balcony, including the height of any protective
balustrade, is not less than 2000 mm.
(2) When placing the terminals, distances of not less than 500
mm must be adopted from materials sensitive to the action
of combustion products (for example, plastic gutters and
downspouts, wooden extrusions, etc.) unless adequate shielding
measures with regard to said materials.
POSITIONING OF THE TERMINALS FOR “FORCED DRAFT” APPLIANCES (extracted from the UNI 7129 standard)
Under window
A
600
Under ventilation opening
B
600
Under the eaves
C
300
Under balcony (1)
D
300
From an adjacent window
E
400
From an adjacent ventilation opening
F
600
From vertical or horizontal pipes or drains (2)
G
300
From a corner of the building
H
300
From a recess of the building
I
300
From the ground or other walking surface
L
2200
Between two vertical terminals
M
1500
Between two terminals horizontally
N
1000
From a front facing surface without openings or terminals within a radius of 3 meters from the
O
2000
flue outlet Same, but with openings or terminals within a radius of 3 meters from the smoke outlet
P
3000
Terminal location
Distances
minimum
in mm
Appliances with heat output
over 16 kW e
up to 35 kW
4.6 CONFIGURATION OF THE AIR INTAKE / SMOKE EXHAUST
DUCTS TYPE B23
Boiler designed to be connected to a flue or to a device for
discharging the products of combustion outside the room in
which it is installed.
The air is drawn in the installation room and the combustion
products are discharged outside the room itself.
The boiler must not be equipped with a windproof draft breaking
device, while it must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
Type C13
Boiler designed to be connected to horizontal exhaust and intake
terminals directed to the outside by means of coaxial or split-type
ducts.
The distance between the air inlet duct and the smoke outlet
duct must be at least 250 mm and both terminals must still be
positioned within a square of 500 mm on each side.
The boiler must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
Type C33
Boiler designed to be connected to vertical exhaust and intake
terminals directed to the outside by means of coaxial ducts or by
means of split-type ducts.
The distance between the air inlet duct and the smoke outlet
duct must be at least 250 mm and both terminals must still be
positioned within a square of 500 mm on each side.
The boiler must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
Type C43
Boiler designed to be connected to a collective flue system
comprising two ducts, one for the intake of combustion air and
the other for the evacuation of combustion products, coaxial or
through split ducts.
The flue must comply with current regulations.
The boiler must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
Type C53
Boiler with combustion air intake ducts and separate combustion
products evacuation.
These ducts can discharge into different pressure zones.
The positioning of the two terminals on opposite walls is not
allowed.
The boiler must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
Type C63
Boiler with combustion air intake ducts and combustion products
evacuation, which can be made using pipes sold and certified
separately.
The system created must not have a pressure drop, with the
boiler at nominal power, higher than the residual head of the fan.
Type C83
Boiler designed to be connected to a terminal for the collection of
combustion air and to an individual or collective chimney for the
discharge of fumes.
The flue must comply with current regulations.
The boiler must be equipped with a fan upstream of the
combustion chamber / heat exchanger.
4.6.1 AIR INTAKE / SMOKE EXHAUST BY COAXIAL DUCTS
WITH DIAMETER 100/60 MM
Tipo C13
These values refer to air intake / flue gas exhaust pipes made
using rigid and smooth pipes originals, supplied by the
manufacturer.
The maximum permissible length of 100/60 mm horizontal
coaxial pipes is 7 meters including the first bend.
For each straight pipe added with a length of 1 meter, the maximum
length allowed must be decreased by 1 meter.
For each 90 ° bend added, the maximum length allowed must be
decreased by 1.5 meter. For each 45 ° bend added, the maximum
length allowed must be decreased by 1 meter. The wall terminal
decreases the maximum permissible length by 1.5 meters. The air
intake part must have a downward slope of 1% in the exit direction, to
avoid the entry of rainwater.
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