33
3.2.6.1. Configuration of air intake and flue gas venting ducts
Type B23
Boiler intended for connection to an existing flue system external to the boiler room.
Combustion air is taken directly from the boiler room itself while flue gas is conveyed to the outside.
The boiler is not to be fitted with anti-wind gust device; it has to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type B53
Boiler intended for connection, via an independent duct, to the flue gas venting terminal.
Combustion air is taken directly from the boiler room itself while flue gas is conveyed to the outside.
The boiler is not to be fitted with anti-wind gust device; it has to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type C13
Boiler intended for connection to horizontal outlet and intake ducts connected to the outside by means of coaxial or split ducts.
The minimum distance between the air intake duct and the flue gas venting duct must be at least 250 mm, whereas both terminals must be
contained within a square measuring 500 x 500 mm.
The boiler is to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type C33
Boiler intended for connection to vertical outlet and intake ducts connected to the outside by means of coaxial or split ducts.
The minimum distance between the air intake duct and the flue gas venting duct must be at least 250 mm, whereas both terminals must be
contained within a square measuring 500 x 500 mm.
The boiler is to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type C43
Boiler intended for connection to collective chimney pipe system that includes two ducts, one for the air intake and the second for flue gas
exhaustion. These ducts may be coaxial or split.
The chimney must be compliant with applicable legislation and standards.
The boiler is to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type C53
Boiler with separate pipes for combustion air intake and flue gas evacuation.
These flues may discharge in areas at a different pressure.
The terminals may not face each other from opposed walls.
The boiler is to be equipped with a fan mounted before the combustion chamber/heat exchanger.
Type C83
Boiler intended to be connected to combustion air terminal and to a single flue gas terminal or collective chimney.
The chimney must be compliant with applicable legislation and standards.
The boiler is to be equipped with a fan mounted before the combustion chamber/heat exchanger.
3.2.6.2. Ø 100/60 mm and Ø 125/80 mm air/flue gas coaxial duct system
The information given above is with reference to air intake/flue gas venting ducts made from smooth, rigid pipes approved
and supplied by the manufacturer.
Type C13
KC 12 - KRB 12 - KR 12
Minimum permissible length of horizontal coaxial pipes is 1 meter.
Maximum permissible length of Ø100/60 mm horizontal coaxial pipes
is 9 meters.
Maximum permissible length of Ø125/80 mm horizontal coaxial pipes is
13.5 meters.
For each additional 1 meter of straight pipe maximum permissible
length is to be reduced by 1 meter.
For each additional 90° elbow, maximum permissible length is to be
reduced by 1 meter.
For each additional 45° elbow, maximum permissible length is to be
reduced by 0.5 meter.
The wall terminal reduces maximum permissible length by 1.5 meters.
The air intake duct is to be tilted down by 1% toward its exit, in order to
avoid rain water to enter it.
The flow resistance of the first elbow shall not be taken into account to
calculate maximum permissible length.
KC 24 - KRB 24 - KR 24
Minimum permissible length of horizontal coaxial pipes is 1 meter.
Maximum permissible length of Ø100/60 mm horizontal coaxial pipes is
10 meters.
Maximum permissible length of Ø125/80 mm horizontal coaxial pipes is
14.5 meters.
For each additional 1 meter of straight pipe maximum permissible
length is to be reduced by 1 meter.
For each additional 90° elbow, maximum permissible length is to be
reduced by 1 meter.
For each additional 45° elbow, maximum permissible length is to be
reduced by 0.5 meter.
The wall terminal reduces maximum permissible length by 1.5 meters.
The air intake duct is to be tilted down by 1% toward its exit, in order to
avoid rain water to enter it.
The flow resistance of the first elbow shall not be taken into account to
calculate maximum permissible length.
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