1
Opening window or door
2
Air inlet
3
Plume displacement kit
A
150mm minimum
Important
If fitting a Plume Displacement Flue Kit, the air inlet must be a
minimum of 150mm from any opening windows or doors.
Important
The Plume Displacement flue gas discharge terminal and air inlet
must always terminate in the same pressure zone i.e. on the same
facing wall.
5.3.7
Horizontal flue/chimney systems
1
315mm to 500mm
2
Flue trims
3
This bend is equivalent to 1 metre
Total equivalent length = A+B+C+2x90° bends
Important
Horizontal flue extensions should always be installed with a fall of
at least 1.5° from the terminal to allow condensate to run back to
the boiler.
The standard telescopic flue is suitable only for horizontal termination ap
plications. It allows for lengths between 315mm and 500mm from elbow to
terminal without the need for cutting. Extensions of 250mm, 500mm and
1m are available.
All fittings should be fully engaged. The approximate engagement is
40mm. Apply the lubricant supplied to the seal on each fitting to aid as
sembly.
Tab.20 Maximum permissible equivalent flue lengths are:-
Horizontal concentric
60/100 Diameter
80/125 Diameter
10 metres
20 metres
Any additional "in line" bends in the flue system must be taken into consid
eration.
Tab.21 Their equivalent lengths are:-
Concentric pipes
135° bend
0.5 metres
93° bend
1.0 metres
The elbow supplied with the standard horizontal telescopic flue kit is not
included in any equivalent length calculations.
Important
Flue length is measured from point (i) to (ii) as shown.
See
Read this section in conjunction with the Flue Installation Guide
supplied with the boiler. This document includes details of vertical
flue/chimney systems and plume displacement kits.
Fig.18
Plume displacement kit
PN-0000458
3
1
2
A
Fig.19
Horizontal flues
PN-0000459
3
1
2
A
3
C
B
(i)
(ii)
5 Before installation
34
