18
8.0 Flue Options
© Baxi Heating UK Ltd 2007
Horizontal
Flues
Y
X
Plume Displacement 60 /100 dia Kit
1M Extensions 45° & 93° bends are
also available - see Section 9.0
Plume Displacement.
8.1 Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
termination applications.
2. Maximum permissible equivalent flue lengths are:-
60/100 80/125
Horizontal Concentric 10 metres 20 metres
3. Any additional “in line” bends in the flue system must be
taken into consideration.
Their equivalent lengths are:-
Concentric Pipes:
135° bend 0.5 metres
93° bend 1.0 metres
Twin Flue Pipe
135° bend 0.25 metres
91.5° bend 0.50 metres
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.
NOTE: Horizontal flue pipes should always be installed with a 1.5° to 3° fall from
the terminal to allow condensate to run back to the boiler.
Y
X
This bend is equivalent to
1 metre
Total equivalent length (upto 10m) =
A+B+C+2x90°Bends
B
A
C
This bend is equivalent to
1 metre
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