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1.4 Examples of flue gas systems
Combustion air
drawn from the
room
External flue gas exhaust. Air drawn from the room.
Air/exhaust gas routing through outside wall in the same pressure
range.
Exhaust gas/fresh air supply system through outside wall.
The Terminal outlets from separate combustion and air supply circuits
shall fit inside a square of 50 cm for boilers with a heat input to 70 kW
and 100 cm with a heat input from 70 up to 100 kW.
Flue gas exhaust and air suction duct from outside with roof terminal
in the same range of pressure.
The Terminal outlets from separate combustion and air supply circuits
shall fit inside a square of 50 cm and distance between the planes of
the two orifices shall be less than 50cm for boilers with a heat input
below 70 kW.
A square of 100 cm and distance between the planes of the two
orifices shall be less than 100 cm with a heat input above 70 kW.
Individual or shared flue gas exhaust and air suction through flue
ducting built into the building
Flue gas exhaust leading outside and air suction duct through external
wall not in the same range of pressure.
Air and exhaust connection to separate tested and supplied
air/exhaust pipes.
Basement / floor installation.
Air and exhaust venting via exterior wall.
Exhaust venting through heat insulated exhaust pipe or moisture
resistant pipe.
Exhaust line (standing air layer) at exterior wall.
The terminals for the supply of combustion air and for the evacuation
of combustion products shall not be installed on opposite walls of the
Flue gas exhaust through individual or shared flue ducting built into
the building. Air suction through external wall.
drawn from
outside
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