adapted to face in any direction BUT must not be directed in the region of the air
inlet.
Table 2.8.4
Minimum Flue Terminations & Air Inlet Dimensions
The two terminals are subject to the requirements of BS 5440 Pt 1 for clearances
from features of the building although some can be decreased to the values
indicated.
If either the air inlet or the flue outlet terminate at a height of less than 2m (6ft)
above ground level the termination must be protected by a suitable guard. The K4
terminal guard, manufactured by Tower Flue Components Ltd, is suitable for this
purpose and can be obtained from Keston Boilers.
The Keston condensing boiler, as with any condensing boiler, will generate a
condensate “plume” from the flue terminal in all weather conditions. Consideration
must therefore be given to the effect of this “plume” when selecting a location for
the flue terminal. It is advisable, for horizontal flue terminals, to place a 45
O
elbow
at the end of the flue to direct the condensate plume up and away from the
property,
2.8.5
Clearances From Wall
Flue outlet and air inlet terminations must be at least 60 mm and 95 mm
respectively from the wall face.
2.8.6
Distance Between Flue Outlet & Air Inlet
There is no maximum - the terminations can be on opposite sides of the dwelling
if desired.
A minimum clearance of at least 500 mm must be left between the terminations.
2.8.7
General Installations
All parts of the system must be constructed in accordance with BS 5440 Part 1,
except where specifically mentioned in these instructions.
All pipework must be adequately supported.
WD51/2/1997 Chapter 2 - Boiler Connections The Keston 170 Condensing Boiler
Installation & Servicing Instructions
Page : 13
300
300
L Horizontally from terminal on same wall.
1,500
1,500
K Vertically from terminal on same wall.
100
1,200
J
From opening in a car port.
1,200
1,200
I
From terminal facing a terminal.
100
600
H From surface facing a terminal
100
300
G Above ground or balcony or roof.
50
600
F From internal or external corner.
50
75
E From vertical drain or soil pipes.
50
200
D Below balconies or car port roof.
50
300
C Below eaves.
75
75
B Below gutters, soil pipes, drain pipes.
50
300
A Below openable window, air brick, etc.
Air
Inlet
Flue
Terminal
Dimensions (mm)
