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© Baxi Heating UK Ltd 2016
8.0 Flue Options
Horizontal
Flues
Y
X
Plume Displacement Kit 60 /100 Ø
1M Extensions, 45° & 93° bends are
also available - see Section 9.0
(ii)
(i)
This bend is equivalent to
1 metre
Total equivalent length =
A+B+C+2x90°Bends
B
A
C
This bend is equivalent to
1 metre
8.1 Horizontal Flue Systems
1. The standard flue is suitable only for horizontal termination
applications.
2. All fittings should be fully engaged. The approximate
engagement is 40mm. Apply soap solution to the seal on
each fitting to aid assembly.
3. Maximum permissible equivalent flue lengths are:-
(60/100) (80/125)
Horizontal Concentric 10 metres 20 metres
4. 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
4. 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.
IMPORTANT
SUPPORT - All flue systems MUST be securely
supported a MINIMUM of once every metre. It is
recommended that every straight piece is supported
irrespective of length. Additional supports are available
as accessories.
VOIDS - Consideration must be given to flue systems in
voids and the provision of adequate access for
subsequent periodic visual inspection.
6. Read this section in conjunction with the Flue Installation
Guide supplied with the boiler.
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.
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