5.3.5
Clearances
A flat vertical area is required for the installation of the boiler and it should
be capable of bearing the weight of the boiler when full of water.
These dimensions include the necessary clearances around the boiler for
case removal, spanner access and air movement. Additional clearances
may be required for the passage of pipes around local obstructions such
as joists running parallel to the front face of the boiler.
In the diagram these are MINIMUM recommended dimensions. Greater
clearance will aid installation and maintenance.
5.3.6
Flue/chimney location
The following guidelines indicate the general requirements for siting bal
anced flue terminals. For GB recommendations are given in BS 5440 Pt 1.
For IE recommendations are given in the current edition of I.S. 813 Do
mestic Gas Installations.
Important
Due to the nature of the boiler a plume of water vapour will be dis
charged from the flue. This should be taken into account when sit
ing the flue terminal.
Fig.16
Flue outlets
R
T
U
J,K
J,K
A
D
E
C
I
I
I
A
A
S
F
H
H
B
G
F
I
I
L
N
M
PN-0000456
1
1
Flue positions marked require a flue terminal guard.
Tab.19 Terminal position with minimum distance
Key
Description
mm
Key
Description
mm
A
(1)
Directly below an opening, air brick open
ing window etc.
300
J
From a surface or boundary line facing
a terminal
600
B
(1)
Above an opening, air brick, opening win
dow etc.
300
K
From a terminal facing a terminal
(Horizontal flue)
1200
From a terminal facing a terminal (Ver
tical flue)
600
Fig.15
Clearances
700
PN-0000344
285
390
5
5
178
200
450
5
5 Before installation
32
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