4
centre of the glass window is 157mm below the centre of the flue terminal. The
centre of the terminal should be positioned at least 700mm above floor level to
allow space for the fascia to drop down on its runners. If the fireplace has to be
altered a lintel will be required to support masonry over the opening and if it is
to be surface mounted the maximum wall thickness allowed is 405mm. If the
appliance is to be inset into the wall this may be increased to 525mm.
If required, a longer flue duct is available which allows the maximum wall
thicknesses to be increased to 800mm for the surface mount installation and
920mm for the inset installation.
3
Flue Terminal Position
The minimum distances permissible from the flue terminal to obstructions and
ventilation openings are shown below.
DIMENSION
TERMINAL POSITION
MINIMUM
DISTANCE
A
Directly below an opening, air brick or window, etc.
300mm
B
Above an opening, air brick, opening windows, etc.
300mm
C
Horizontally to an opening, air brick, opening windows,
etc.
300mm
D
Below plastic gutters, soil pipes or drain pipes
300mm
E
Below eaves
300mm
F
Below balconies or car port roof.
600mm
G
From a vertical drainpipe or soil pipe. (Eire only 75)
(GB) 300mm
H
From an internal or external corner.
600mm
I
Above ground, roof or balcony level.
300mm
J
From a surface facing the terminal.
600mm
K
From a terminal facing a terminal.
600mm
L
From an opening in a carport (e.g. door, window) into the
dwelling.
1200mm
M
Vertically from a terminal on the same wall.
1500mm
N
Horizontally from a terminal on the same wall.
300mm
From an opening in a building directly opposite.
600mm
Not shown
on diagram Below horizontal hinged windows (Eire only)
1000mm
Figure 1
