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8.0 Flue Options
18
© Baxi Heating UK Ltd 2007
8.1 Horizontal Flue Systems
1. The Potterton Performa 30 HE can be fitted with
either horizontal, vertical or twin flue systems as
illustrated.
2. The standard flue is suitable only for horizontal
applications.
3. Maximum permissible equivalent flue lengths are:-
Horizontal Concentric 3m
Vertical Concentric 3m
Vertical Twin Pipe 12m
4. Any additional “in line” bends in the flue system must
be taken into consideration. Their equivalent lengths
are:-
Concentric Pipes:
45° bend 0.5 metres
93° bend 1.0 metres
Twin Flue Pipe
45° bend 0.25 metres
91.5° bend 0.50 metres
The elbow supplied with the standard horizontal flue is
not included in any equivalent length calculations
6. The illustrations opposite show examples of
maximum equivalent lengths.
7. Full details of part numbers and descriptions of all
optional flue components and kits can be found in the
Baxi Flue Guide.
8. Instructions for guidance and fitting are included in
each kit where appropriate.
NOTE: Flue length is measured from point X to Y
as shown.
Horizontal
Flues
Y
X
Plume Displacement Kit 60 /100 Ø
1M Extensions, 45° & 93° bends are
also available - see Section 9.0
NOTE: Horizontal flue pipes should always be installed with a 1.5° 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 3m) =
A+B+C+2x90°Bends
B
A
C
This bend is equivalent to
1 metre