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A
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CBBAAA
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BBAAAA
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BAAAAA
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Table 7-3: Determination of the permissibility of a concentric system with roof terminal
G20/G25/G25.3
G30/G31
Total number of metres
horizontal pipe length
Total number of metres vertical and/or sloping pipe length
No bends
2 bends
3 bends
4 bends
5 bends
Situation is not permissible. There are many more possibilities in combination with the DRU PowerVent® system
(DRU PV-I 100/60) (see PowerVent® installation manual).
Table 7-4: Conditions for setting the appliance when using a roof terminal
G20/G25/G25.3/G30/G31
Situation
A
B
C
D
Air inlet guide
NO
1
1
2
Restrictor slide
NO
NO
YES
YES
Restrictor slide
(Distance in mm)
-
-
68
48
* This number must agree with the number on the air inlet guide.
** Adjust the restrictor slide to match the associated letter on the restrictor slide.
3- In case of a roof terminal without bends: first connect 0.8 metres of concentric system vertically on the
appliance with a diameter of 200/130 mm. After the first 0.8 metres, reduce the concentric system to a 150/100
mm diameter, including a 150/100 mm roof terminal.
- In case of a roof terminal with bends: first connect 0.8 metres of concentric system vertically on the appliance
with a diameter of 200/130 mm. Make the concentric system with a 200/130 mm diameter, and reduce the
concentric system immediately after the last bend to 150/100 mm, including 150/100 mm roof terminal.
24


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