Siting The Flue Terminal; Air Supply - Worcester 26CDi XTRA Installation And Servicing Instructions

5. Siting the Flue Terminal

See fig. 4 and 15.
5.1 The flue must be installed as specified in BS 5440:Part 1.
Important. The flue must be installed with an incline of 2
(44mm per metre length) towards the appliance. See fig. 15.
5.2 The terminal must not cause an obstruction nor the
discharge cause a nuisance.
5.3 If the terminal is fitted within 1000mm of a plastic or painted
gutter or within 500mm of painted eaves then an aluminium
shield at least 1000mm long should be fitted to the underside of
the gutter or painted surface.
5.4 If a terminal is fitted less than 2 metres above a surface to
which people have access then a guard must be fitted. See
Section 2.9.
5.5 The terminal guard must be evenly spaced about the flue
terminal and fixed to the wall using plated screws.
5.6 A white plume of condensation will be emitted from the flue
terminal. Siting where this could cause a nuisance should be
avoided. Keep clear of security lighting activated by passive infra
red sensing heads.
5.7 IMPORTANT: It is absolutely essential to ensure that
products of combustion discharging from the terminal cannot re-
enter the building, or any other adjacent building, through
ventilators, windows, doors, natural air filtration, or forced
ventilation/air conditioning. If products of combustion are found
to be re-entering any building, the appliance MUST be turned
OFF immediately.
Fig. 4. Siting of the flue terminal
A
A
F
A
G
M
E
G
H,I
B,C
B,C
L
G
K
F
F
G
6.1 The appliance does not require a separate vent for
combustion air.
l / °
2
6.2 The appliance can be fitted in a cupboard with no vents for
cooling but the minimum clearances must be increased to those
given below. (Note: The clearances at the front are for a
removable panel, e.g. a door.)
Above the flue turret. (Refer to note on fig. 2.)
In front
Below
Right-hand side
Left-hand side
6.3 If the appliance is to be fitted in a cupboard or compartment
with less clearance than those in the table above (minimum
clearances are given in Section 4. Siting the appliance) then
permanent air vents for cooling are required. One at high level
and one at low level, either direct to outside air or to a room.
Both vents must pass to the same room or be on the same wall
to the outside air.
6.4 The minimum free areas required are given below:
Position of air
vents
High level
Low level
6.5 Refer to BS 6798 and BS 5440:2 for additional information.
C
Terminal Position
A - Directly below an openable window
or other openings e.g. air brick
K
B - Below gutters, soil pipes or
L
drain pipes
K
C - Below eaves
– Below balconies or car port roof
E - From vertical drain pipes and
G
soil pipes
F - From internal or external corners
G - Above ground, roof or balcony level
H - From a surface facing a terminal
I - From a terminal facing a terminal
– From an opening in a car port
(e.g. door or window) into a dwelling
K - Vertically from a terminal on the
same wall
L - Horizontally from a terminal on the
same wall
M - From door, window or air vent
achieve where possible
8

6. Air Supply

Air from the Air direct from
room outside
270cm 2 135cm
2
270cm 135cm
Min. Distance
300mm (12 in)
75mm (3 in)
200mm (8 in)
Not recommended
75mm (3 in)
300mm (12 in)
300mm (12 in)
1200mm (48 in)
2000mm (78 in)
Not recommended
1500mm (59 in)
300mm (12 in)
300mm (12 in)
30mm
250mm
200mm
75mm
75mm
2
2