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7.0 Site Requirements
7.11 Flue Options
1. The Baxi Combi Instant 80 HE and 105 HE can be
fitted with flue systems as illustrated.
2. The standard flue is suitable only for horizontal
applications.
3. Maximum permissible equivalent flue lengths are:-
Instant Instant
80 HE 105 HE
Concentric 4m 3m
Vertical 4m 3m
Vertical Two-Pipe 12m 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
5. The illustrations opposite show examples of
maximum equivalent lengths.
6. Full details of part numbers and descriptions of all
optional flue components and kits can be found in the
Baxi Flue Guide.
7. Instructions for guidance and fitting are included in
each kit where appropriate.
Horizontal
Flues
Vertical
Flues
Vertical
Flues
(Twin Pipe)