Baxi LUNA HT 1.450 Installers And Users Instructions page 75

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Flue duct terminal Max. length
of flue duct
Coaxial Ø 80/125 mm
Vertical two-pipe
Horizontal two-pipe
... coaxial flue - air duct (concentric)
This type of duct allows to disengage exhaust gases
and to draw combustion air both outside the building
and in case a LAS flue is fitted.
The 90° coaxial bend allows to connect the boiler to a
flue-air duct in any direction as it can rotate by 360°.
It can moreover be used as a supplementary bend and
be coupled with a coaxial duct or a 45° bend.
If the flue outlet is placed outside, the flue-air ducting
must protrude at least 18mm out of the wall to allow
alluminium weathering tile to be fitted and sealed to
avoid water leakages.
Ensure a minimum downward slope of 1 cm towards
the outside per each metre of duct length.
A 90° bend reduces the total duct length by 1 me-
tre.
A 45° bend reduces the total duct length by 0.5
metre.
Horizontal flue terminal Ø 80/125 mm installation options
LAS flue duct Ø 80/125 mm installation options
Each 90° bend
reduces the duct
max. length by
10 m 1 m
15 m 0,5 m
60 m 0,5 m
L max = 10 m
75 75
Each 45° bend Flue
reduces the duct terminal
max. length by diameter
0,5 m 100 mm
0,25 m 133 mm
0,25 m
Concentric outlet
Figure 8
Outer
terminal
diameter
125 mm
80 mm
- 80 mm