9
221992D
3 Flue and Ventilation
FROM
OUTSIDE
COMPARTMENT AIR VENT TABLE
COMPARTMENT
VENTILATION
REQUIREMENTS
VENTILATION
FROM ROOM
OR SPACE
HIGH LEVEL
LOW LEVEL
VENT AREA
VENT AREA
The flue must be installed in accordance with the rules in force
in the countries of destination.
3.1 Terminal Position
The minimum acceptable siting dimensions for the terminal
from obstruction, other terminals and ventilation openings are
shown in diagram 3.1.
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
272cm
2
42in
2
272cm
2
42in
2
136cm
2
21in
2
272cm
2
42in
2
MINIMUM SITING DIMENSIONS FOR
FANNED FLUE TERMINALS POSITION
MM
HORIZONTAL FLUES
A DIRECTLY BELOW, ABOVE OR
HORIZONTALLY TO AN OPENING, AIR BRICK,
OPENING WINDOW, AIR VENT, OR ANY
OTHER VENTILATION OPENING
300
B BELOW GUTTER, DRAIN/SOIL PIPE
25
C BELOW EAVES
25
D BELOW A BALCONY OR CAR PORT
25
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
25
F FROM INTERNAL/EXTERNAL CORNERS
OR TO A BOUNDARY ALONGSIDE THE
TERMINAL
25
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL
300
H FROM SURFACE OR A BOUNDARY
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
Diagram 3.1
A
A
E
G
G
B,C
B,C
F
K
C
UNDER CAR PORT etc.
H,I
J
D
F
K
F
L
11508
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.
3.2 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
document IGE/UP/7/1998. If in doubt seek advice from the local
gas undertaking or Halstead Boilers Ltd.
3.3 Terminal Guard
A terminal guard is required if persons 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
3.4 Room Ventilation
The boiler is room sealed and does not require the room or
space containing it to have permanent air vents.
3.5 Ventilation for Boilers installed in a
Cupboard
For minimum ventilation and clearances for cupboard installation
refer to section 1.7 and diagram 1.6.
3.6 Compartment Ventilation
Where the boiler is fitted in a compartment, the high and low
level permanent air vents must have effective areas, see
“Compartment Air Vent Table”.
Both the high and level air vents must communicate with the
same room or must both be on the same wall to outside air.
