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B023
In calculating the lengths of the pipes, the maximum length 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 discharge/intake vent pipes must have the same diameter of ø 80 mm.
2. The maximum combined flue length is 17 m. In this case the minimum length
for the air intake pipe is 1 meter; the maximum length of vertical
exhaust pipe must be a maximum of 12 m.
3. If an elbow is inserted into the discharge/ventilation system, the calculation
of the overall extension must take into consideration the values for each
curve, as indicated in the table.
4. The exhaust pipe must extend at least 0.5 m above the ridge of the roof if it is
located on a side other than that for the air intake (this is not obligatory if
the exhaust and air intake pipes are located on the same side of the
building).
(*) L = Length of Piping
C12 (xx) 4 m ø 60 /100 L* < 0.5 m
Coaxial
System C32 (xx) 4 m ø 60 /100 L* < 0.5 m
C42 (xx) 4 m ø 60 /100 L* < 0.5 m
23 kW 27 kW
C12 (xy) 54 m 46 m ø 80 L < 7 m (23 kW) L < 5 m (27 kW) L > 4 9 m (23 kW) L > 6.5 m (27 kW)
C32 (xy) 54 m 46 m ø 80 L < 7 m (23 kW) L < 5 m (27 kW) L > 4.9 m (23 kW) L > 6.5m (27 kW)
Twin Pipe
Systems C42 (xy) 54 m 46 m ø 80 L < 7 m (23 kW) L < 5 m (27 kW) L > 4.9m (23 kW) L > 6.5m (27 kW)
C52 (xy) 17 m 17 m ø 80 L < 7 m (23 kW) L < 5 m (27 kW) L > 4.9m (23 kW) L > 5.3m (27 kW)
Exhaust Type
Diameter of Pipes
(mm)
Use of a Restrictor
on the Discharge Side
Risk of Condensation Forming
Maximum Extension
Exhaust/Air