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8.0 Flue Options
© Baxi Heating UK Ltd 2011
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 supplied with the standard horizontal telescopic
flue kit is not included in any equivalent length calculations
NOTE: Flue length is measured from point (i) to (ii) as
shown.
IMPORTANT: All flue systems must be securely supported
at least once every metre. Suitable pipe supports are
available as accessories.
Horizontal
Flues
(ii)
(i)
Plume Displacement Kit 60 /100 Ø
1M Extensions, 45° & 93° elbows
are also available - see Section 9.0
NOTE: Horizontal flue pipes should always be installed with at least a 1.5° fall
from the terminal to allow condensate to run back to the boiler.
(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
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