43
installation
Combustion air drawn from the room
B22
Air drawn from the room
B32
Individual or shared fl ue gas exhaust
ducting built into the building
Air drawn from the room
Combustion air intake from outside
C12
Flue gas exhaust and air suction duct
through external wall in the same range of
pressure
C22
Individual or shared fl ue gas exhaust
and air suction through fl ue ducting built
into the building
C32
Flue gas exhaust andair suction duct
from outsidewithroof terminalin the same
range of pressure
C42
Individual or shared fl ue gas exhaust
and air suction through fl ue ducting built
into the building
C52
Flue gas exhaust leading outside and
air suction duct through external wall not in
the same range of pressure
C82
Flue gas exhaust through individual or
shared fl ue ducting built into the building
Air suction through external wall
Type of air suction/fl ue gas exhaust ducting