33
3.2.6.1.
Configuration of the air intake/flue gas exhaust ducts
T
ype
B23
Boiler designed to be connected to a flue or to a combustion product discharge device outside the room in which it is installed. The air
intake takes place in the installation room and the combustion products discharge takes place outside the room itself.The boiler must not
be equipped with an anti-wind draft 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 outside by coaxial type ducts or by 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 in any case be
positioned within a square with a side of 500 mm. 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 outside by coaxial type ducts or by 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 in any case be positioned
within a square with a side of 500 mm. 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 via 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 separate combustion air intake ducts and combustion products evacuation.These ducts can discharge into different pressure
zones. The positioning of the two terminals on opposite walls is not permitted.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 ducts that can be made using separately marketed and
certified pipes.The system created must not have a pressure drop, with the boiler at nominal power, greater than the residual head of the
fan.
Type
C83
Boiler designed to be connected to a combustion air intake terminal and to an individual or collective flue for flue gas discharge.
The flue must comply with current regulations.
The boiler must be equipped with a fan upstream of the combustion chamber/heat exchanger.
