Baxi Luna HT Installers And Users Instructions page 15

Flue duct terminal
Coaxial Ø 60/100 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 metre.
A 45° bend reduces the total duct length by 0.5 metre.
Horizontal flue terminal Ø 60/100 mm installation options
L max = 10 m
L max = 9 m
LAS flue duct Ø 60/100 mm installation options
°
Max. length Each 90 bend
of flue duct reduces the duct
max. length by
10 m 1 m
15 m 0,5 m
80 m 0,5 m
L max = 10 m
15
°
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 10
L max = 10 m
L max = 9 m
Outer
terminal
diameter
100 mm
80 mm
- 80 mm