Dru G20, Installation Manual, Page: 26 / 40

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English
I NS TAL L A TIO N M A N U A L
UK
Table 5: Determining permissibility concentric system
G20/G25/G31 Total number of meters
horiz.
pipe length
Total no. of meters vertical and/or sloping pipe length
no bends
2 bends
3 bends
4 bends
5 bends
Situation is not permissible
minimum length
Situation
A
B
C
D
Air inlet guide
NO
YES
YES
YES
Table 6: Conditions for the adjustment of the appliance with a roof terminal
Restrictor slide
NO
YES
YES
YES
Distance restrictor. in mm
OPEN
14
9
5
G20/G25
Permissibility and conditions concentric system with roof terminal