Flue Terminal Position; Air Supply - Worcester Highflow 400 BF Installation And Servicing Instructions

Fig. 4. Siting of the flue terminal.
MINIMUM SITING DIMENSIONS FOR POSITIONING THE BALANCED
FLUE TERMINAL
A1
A
G
D
H I
A
E
F
J

5. Flue Terminal Position

5.1 The flue must be installed as specified by BS 5440:Part 1and
the building regulations.
NOTE: Installations coming under the jurisdiction of Building
Control should adhere to the increased clearances.
5.2 TERMINAL POSITION. See Fig. 4.
5.3 The terminal must not cause an obstruction nor the
discharge a nuisance.
5.4 If the terminal is fitted within 850mm of a plastic or painted
gutter or within 450mm of painted eaves then an aluminium
shield at least 750mm long should be fitted to the underside of
the gutter or painted surface.
5.5 If a terminal is fitted less than 2 metres above a surface to
which people have access then a guard must be fitted. Refer to
Section 2, Item 2.9.
5.6 The terminal guard must be evenly spaced about the flue
terminal and fixed to the wall using plated screws
5.7 In certain weather conditions a terminal may steam and
siting where this could cause a nuisance should be avoided.
5.8 Take care to ensure that combustion products do not enter
ventilated roof voids.
B C
L
A2
L
F
F
G
M
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.
G– Above ground, roof or balcony level.
K
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
K
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).

6. Air Supply

6.1 The appliance does not require a separate vent for
combustion air.
6.2 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 the
outside air.
6.3 There must be sufficient clearance around the appliance to
allow proper circulation of ventilation air. Refer to Section 4,
Item 4.6.
6.4 The minimum free areas required are given below.
POSITION OF
VENTS
HIGH LEVEL
LOW LEVEL
6.5 Refer to BS 6798 and BS 5440:2 for additional information.
8
MIN. DISTANCE
1500mm (60 in.)
300mm (12 in.)
600mm (60 in.)
300mm (12 in.)
300mm (12 in.)
600mm (24 in.)
75mm (3 in.)
600mm (24 in.)
300mm (12 in.)
600mm (24 in.)
600mm (24 in.)
1200mm (47 in.)
1500mm (59 in.)
300mm (12 in.)
300mm (12 in.)
AIR FROM AIR DIRECT
THE ROOM FROM OUTSIDE
2
270 cm 135 cm
2 2
(42 in ) (21 in
2
270 cm 135 cm
2 2
(42 in ) (21 in
2
)
2
)