Flue Options - Potterton Promax System HE Plus LPG Installation & Service Instructions Manual

Plume Displacement 60 /100 dia Kit
1M Extensions 45° & 93° bends are
also available - see Section 9.0
Plume Displacement.
NOTE: Horizontal flue pipes should always be installed with a fall of at least 1.5°
from the terminal to allow condensate to run back to the boiler.
This bend is equivalent to
1 metre
A
18
© Baxi Heating UK Ltd 2008
X
Horizontal
Flues
C
B
This bend is equivalent to
1 metre
X
Total equivalent length =
A+B+C+2x90°Bends

8.0 Flue Options

8.1 Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
termination applications.
2. Maximum permissible equivalent flue lengths are:-
Y
Horizontal Concentric
3. Any additional "in line" bends in the flue system must be
taken into consideration.
Their equivalent lengths are:-
Concentric Pipes:
135° bend
93° bend
Twin Flue Pipe
135° bend
91.5° bend
The elbow connected to the boiler adaptor is not included
in any equivalent length calculations
5. The illustrations opposite show examples of permissible
flue systems.
NOTE: Flue length is measured from point X to Y as
shown.
Y
60/100 80/125
10 metres 20 metres
0.5 metres
1.0 metres
0.25 metres
0.50 metres