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Permissibility and conditions concentric system with roof terminal
G20/G25/G31
no bends
2 bends
3 bends
4 bends
5 bends
= Situation is not permissible
minimum length
G20/G25/G31
UK
Table 5: Determining permissibility concentric system
Total number of meters
horiz.
pipe length
Table 6: Conditions for the adjustment of the appliance with a roof terminal
Situation
Air inlet guide
A
B
C
D
Total no. of meters vertical and/or sloping pipe length
B
B
B
C
C
A
A
B
B
B
A
A
B
B
A
A
B
A
A
A
A
A
A
B
B
A
A
A
B
A
A
A
A
A
A
A
A
A
A
B
A
A
A
A
A
A
A
A
A
A
Restrictor slide
NO
NO
YES
YES
YES
YES
YES
YES
IN S TA L L A TI O N M A N U A L
C
C
C
D
D
C
C
C
C
C
B
C
C
C
C
B
B
C
C
C
B
B
B
C
A
B
B
B
C
C
C
C
B
B
C
C
C
B
B
B
C
C
A
B
B
B
A
A
B
B
B
C
C
C
B
B
B
C
C
A
B
B
B
C
A
A
B
B
A
A
A
Distance restrictor. in mm
OPEN
36
27
22
D
D
D
D
C
C
D
C
C
C
C
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