Siting The Flue Terminal; Air Supply - Worcester 28CDi RSF Installation And Servicing Instructions

5. Siting The Flue Terminal

See Fig. 4
5.1 The flue must be installed as specified in BS 5440:Part 1.
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 In certain weather conditions a terminal may steam and
siting where this could cause a nuisance should be avoided.
5.7 Take care to ensure that combustion products do not enter
ventilated roof voids.
Fig. 4. Siting of the flue terminal.
TERMINAL POSITION
A– directly below an openable window or
other opening e.g. air brick.
B– Below gutters, soil pipes or drain pipes.
C– Below eaves.
D– Below balconies or car port roof.
E– From vertical drain pipes and 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
J– From an opening in a car port (e.g. door
window) into 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).
A
G
D
HI
MIN. DISTANCE
300 mm (12 in.)
75 mm (3 in.)
25 mm (1 in.)
25 mm (1 in.)
25 mm (1 in.)
25 mm (1 in.)
300 mm (12 in.)
600 mm (24 in.)
1200 mm (47 in.)
1200 mm (47 in.)
150 mm (6 in.)
300 mm (12 in.)
150 mm (6 in.)
B,C
A
F J E
6.1 The appliance does not require a separate vent for
combustion air.
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
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.
F
G
M
6

6. Air Supply

AIR FROM AIR DIRECT
THE ROOM FROM OUTSIDE
2
315 cm 158 cm
2
315 cm 158 cm
L
K
L
K
F
30mm
250mm
200mm
75mm
75mm
2
2