Siting The Flue Terminal; Air Supply - Worcester 24CDi BF 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 1and
the building regulations.
NOTE: Installations coming under the jurisdiction of Building
Control should adhere to the increased clearances.
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 opening, air brick,
window etc.
A1– Above an opening, air brick,
window etc.
A2– Horizontaly to an opening, air brick,
window etc.
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.
A1 A
G
D
HI
F
MIN. DISTANCE TERMINAL POSITION
G– Above ground, roof or balcony level.
1500mm (60 in.)
H– From a surface facing a terminal.
I– From a terminal facing a terminal
300mm (12 in.)
J– From an opening in a car port (e.g. door
window) into dwelling.
600mm (60 in.)
K– Vertically from a terminal on the same
300 mm (12 in.) wall.
300 mm (12 in.) L– Horizontally from a terminal on the same
wall.
600 mm (24 in.)
M– From door, window or air vent (achieve
75 mm (3 in.)
where possible).
600 mm (24 in.)
B,C
A
G
M
J E

6. Air Supply

6.1 Installations in cupboards or compartments require
permanent vents for cooling purposes, 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 outside
air.
6.2 Refer to BS 6798 and BS 5440:2 for additional information.
6.3 There must be sufficient clearance around the appliance to
allow proper circulation of ventilation air. The clearances
required for Installation and Servicing will normally be adequate
for ventilation.
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.
MIN. DISTANCE
A2
F
F
7
AIR FROM AIR DIRECT
THE ROOM FROM OUTSIDE
2
270 cm 135 cm
2
540 cm 270 cm
300 mm (12 in.)
600 mm (24 in.)
600 mm (24 in.)
1200 mm (47 in.)
1500 mm (59 in.)
300 mm (12 in.)
300 mm (12 in.)
L
K
L
K
2
2