8
2000225231B
2 Flue and Ventilation
A
A
F
G
E
A
G
G
G
B,C
B,C
F
F
K
K
K
C
G
L
L
Diagram 2.1
MINIMUM SITING DIMENSIONS
FOR FANNED FLUE
TERMINALS POSITION
A
DIRECTLY BELOW, ABOVE OR
HORIZONTALLY TO AN OPENING, AIR BRICK,
OPENING WINDOWS, AIR VENT OR ANY
OTHER VENTILATION OPENING.
300
B
BELOW GUTTER, DRAIN/SOIL PIPE
75
C
BELOW EAVES
200
D
BELOW A BALCONY OR CAR PORT
200
E
FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
75
F
FROM EXTERNAL CORNERS
300
G
ABOVE ADJACENT GROUND OR
BALCONY LEVEL
300
H
FROM A SURFACE FACING THE
TERMINAL
600
I
FACING TERMINALS
1200
J
FROM OPENING (DOOR/WINDOW) IN
CAR PORT INTO DWELLING
1200
K
VERTICAL FROM A TERMINAL
1500
L
HORIZONTALLY FROM A TERMINAL
300
M
FROM INTERNAL CORNERS
25
MINIMUM
SPACING
in mm
0103M
Under Car Port etc.
H,I
J
D
F
K
M
NOTE:
Detailed recommendations for flues are given in the
current issue of BS5440 Part 1.
2.1 Terminal Position
The minimum acceptable siting dimensions for the terminal
from obstruction, other terminals and ventilation openings are
shown in diagram 2.1. For Ireland the minimum distances for
flue terminal positioning must be those detailed in I.S.813
"Domestic Gas Installations".
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
Car ports or similar extensions of a roof only, or a roof and one
wall, require special consideration with respect to any openings,
doors, vents or windows under the roof. Care is required to
protect the roof if it is made of plastic sheeting. If the car port
consists of a roof and two or more walls, seek advice from the
local gas company before installing the boiler.
If the terminal is fitted within 600mm below plastic guttering or
painted soffit an aluminium shield 1500mm long should be fitted
immediately beneath the guttering or eaves. If the terminal is
fitted within 450mm below painted eaves or a painted gutter, an
aluminium shield 750mm long should be fitted immediately
beneath the guttering or eaves.
2.2 Terminal Guard
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
a minimum of 50mm clearance from any part of the terminal and
be central over the terminal.
A suitable guard, reference Type “K3”, can be obtained from:-
Tower Flue Components Ltd
Morley Road
Tonbridge
Kent. TN9 1RA
