TWIN PIPE
SYSTEMS
FIG. 2.11
In calculating the lengths of the pipes, the
maximum length “L” must also take into
consideration the values for the
exhaust/air intake end terminals, as well
as 90° elbows for coaxial systems.
The C52 types must comply with the
following requirements:
1 - The exhaust/air intake pipes must
have the same diameter of
ø 80 mm.
2 - If elbows are to be inserted into the
air intake and/or exhaust system, the
calculation of the overall length must
take into consideration the values for
each elbow, see the
FLUE PIPE
ACCESSORIES MANUAL.
3 - The exhaust pipe must protrude by at
least 0.5 m above the top of the roof
in the event that it is located on the
opposite side of the building to the
side with the air intake (this condition
is not obligatory when the air intake
and exhaust are located on the same
side of the building).
Exhaust
Type
C12 (xy)
C32 (xy)
C42 (xy)
C52 (xy)
C82 (xy)
Restrictor
ø 43 mm
L max = 11.5 m
L max = 11.4 m
Maximum
Extension
Exhaust/Air
43 m
43 m
43 m
40 m
NO Restrictor
L min = 11.5 m
L max = 43 m
L min = 11.4 m
L max = 40 m
Risk of Condensation Forming
Twin Pipe
Systems
ø 80/80
Piping not insulated
ø 43 restrictor NO
4.3 m 6.9 m
4.3 m 6.9 m
Piping insulated
ø 43 restrictor NO
NONE NONE
5.7 m 21.7 m
L = Sum of the total length of exhaust + air intake piping.
11
Exhaust
Type
C12 (xx)
C32 (xx)
C42 (xx)
Restrictor
ø 43 mm
L min = 0.5 m
L max = 2 m
Maximum
Extension
Exhaust/Air
L = 4 m
NO Restrictor
L min = 2 m
L max = 4 m
Risk of Condensation Forming
Coaxial
Systems
ø 60/100
Piping not insulated
ø 43 restrictor NO
NONE NONE
Piping insulated
ø 43 restrictor NO
NONE NONE
TABLE 2.1
23 MFFI
FU007A
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