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3.2.6.1. Configuration of the air suction / fumes exhaust pipes
Type B23
The boiler is designed to be connected to a flue or combustion products draining device toward the outside of the room in which it is in-
stalled. The air is taken in from the installation room and the combustion products are discharged outside the same room.
The boiler must not be equipped with a windproof draught diverting device, but it must feature a fan upstream the combustion chamber/
heat exchanger.
Type C13
The boiler is designed to be connected to horizontal discharging and suction terminals directed toward outside by means of coaxial type
pipes or by means of split type pipes.
The distance between the air suction pipe and the fumes exhaust pipe must be minimum 250 mm and both terminals must be positioned
in a square having 500 mm side.
The boiler must be equipped with a fan upstream the combustion chamber/heat exchanger.
Type C33
The boiler is designed to be connected to vertical exhaust and suction terminals directed toward outside by means of coaxial type pipes
or by means of split type pipes.
The distance between the air inlet pipe and the fumes outlet pipe must be minimum 250 mm and both terminals must be positioned in a
square having 500 mm side.
The boiler must be equipped with a fan upstream the combustion chamber/heat exchanger.
Type C43
The boiler is designed to be connected to a collective flues system consisting of two ducts, one for combustion air suction and the other
for the discharging of the combustion products, be it coaxial or split.
The flue system must comply with the standards in force.
The boiler must be equipped with a fan upstream the combustion chamber/heat exchanger.
Type C53
Boiler with separated comburent air suction pipes and combustion products discharge.
These pipes can discharge into different pressure areas.
It is not allowed to position the two terminals on opposite walls.
The boiler must be equipped with a fan upstream the combustion chamber/heat exchanger.
Type C63
Boiler with comburent air suction and combustion products discharge pipes to be obtained from products available on the market provided
with suitable certification.
The system in this case must not have pressure losses, with the boiler at its nominal power, higher than the residual fan pressure head.
Type C83
The boiler is designed to be connected to a terminal for comburent air suction and separated or collective chimney for fumes discharging.
The flue system must comply with the standards in force.
The boiler must be equipped with a fan upstream the combustion chamber/heat exchanger.
