| Exhaust Type | Maximum Extension Diameter of Pipes | Use of a Restrictor | Risk of Condensation Forming | |
| Exhaust/Air | (mm) | on the Discharge Side | ||
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| C12 (xx) | 4 m | ø 60 /100 | L* < 0.5 m |
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Coaxial |
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System | C32 (xx) | 4 m | ø 60 /100 | L* < 0.5 m |
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| C42 (xx) | 4 m | ø 60 /100 | L* < 0.5 m |
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| 23 kW | 27 kW |
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| 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 |
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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) |
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(*) L = Length of Piping
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 ver tical 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).
B023 | 13 |