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8.0 Flue Options
18
© Baxi Heating UK Ltd 2009
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 (up to 3m) =
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:-
Horizontal Concentric 4 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
The elbow supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point X to Y as
shown.
IMPORTANT: All flue systems must be securely
supported at least once every metre. Suitable pipe
supports are available as accessories.