- 33 -
INST
ALLA
TION
- 33 -
INST
ALLA
TION
GENERAL REQUIREMENTS
Symbol Location position
Minimum dimensions
(mm)
A *
Directly below an opening, air brick, opening window, etc.
300
B *
Above an opening, air brick, opening window, etc.
300
C *
Horizontally to an opening, air brick, opening window, etc.
300
D **
Below temperature-sensitive building components, e.g.
plastic gutter soil pipes or drain pipes
75
E **
Below eaves
200
F
Below balconies
200
G
From a vertical drain pipe or soil pipe
150
H ***
From an internal or external corner
300
I
Above ground, roof or balcony level
300
J
From a surface facing a terminal
600
K
From a terminal facing a terminal
1 200
L
From an opening in the car-port (e.g. door, window) into
the dwelling
Not recommended
M
Vertically from a terminal on the same wall
1 500
N
Horizontally from a terminal on the same wall
300
O
From the wall on which the terminal is mounted
Please refer to the flue
assembly instructions
P
From a vertical structure on the roof
600
Q
Above intersection with the roof
600
R
From a roof window and terminal
600
S
From a roof window and terminal
2 500
* In addition, for temperature and structural reasons, the terminal should not be near than 150
mm to an opening in the building fabric formed for the purpose of accommodating a built-in
element such as a sealed window frame.
** A heat protection shield should also be installed.
*** The reference to external corners does not apply to building protrusions not exceeding 450
mm, such as disused chimneys on external walls.
5.4 Gas supply
The Gas meter is connected to the service pipe by the local gas region or a local gas region
contractor.
If the gas supply for the boiler serves other appliances ensure that an adequate supply is avail
-
able both to the boiler and the other appliance when they are in use at the same time.
Pipework must be of adequate size. Pipes of a smaller size than the boiler inlet connection should
not be used.
Installation pipes should be fitted in accordance with BS 6891 and the complete installation
should be tested for tightness.
For Ireland (IE), refer to I.S.813.2002.
