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INSTRUCTIONS PERTAINING TO THE INSTALLER 926.772.1 - GB/IE
Concentric flue
This type of duct allows to emit exhaust gases and to draw combustion air from outside the building.
The 87° coaxial bend allows to connect the boiler to a ue-air duct in any direction as it can rotate through
360°.
If the ue outlet is placed outside, the ue-air ducting must protrude at least 18mm out of the wall to allow
alluminium weathering tile to be tted and sealed to avoid water leakages. If the terminal is below 2m then a
terminal gaurd is required.
Ensure a minimum downward slope of 3° towards the boiler.
A 87° bend reduces the total ue length by 1 metre.
A 45° bend reduces the total ue length by 0.5 metre.
HORIZONTAL CONCENTRIC FLUES
Boiler Flue Size
Number of Bends 90°
1 2 3 4
WH46 Ø80/125 9 m 8 m 7 m 6 m
WH65 Ø80/125 9 m 8 m 7 m 6 m
VERTICAL CONCENTRIC FLUES
Boiler Flue Size
Number of Bends 90°
1 2 3 4
WH46 Ø80/125 9 m 8 m 7 m 6 m
WH65 Ø80/125 9 m 8 m 7 m 6 m
CONVENTIONAL FLUE
Boiler Flue Size
Number of Bends 90°
1 2 3 4
WH46 Ø80 59,5 m 59 m 58,5 m 58 m
WH65 Ø80 59,5 m 59 m 58,5 m 58 m
Figure 8
990519_0400
Concentric outlet