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4.7
Flue terminal positions
boundary
boundary
Fig. 20 External boiler flue terminal positions
1
A
Directly below an opening, air brick, opening window etc.
1
B
Horizontally to an opening, air brick, opening window, etc.
C
Below a plastic/painted gutter, drainage pipe or eaves if combustible material is protected
2
D
Below a plastic/painted gutter, drainage pipe or eaves without protection to combustible material
E
From vertical sanitary pipework
F
From an external or internal corner or from a surface or boundary alongside a terminal
G
Above ground or balcony level
H
From a surface or boundary facing a terminal
J
From a terminal facing a terminal
K
Vertically from terminal on the same wall
Table 4
1. An opening means an openable element, such as an openable
window, or a permanent opening such as a permanently open air
vent.
Notwithstanding the dimensions above, a terminal should be at least
300mm from combustible material, e.g. a window frame.
Terminals should be positioned so as to avoid products of
combustion accumulating in stagnant pockets around the building or
entering into buildings.
2. A way of providing protection of combustible material would be to fit
a heat shield at least 750mm wide.
3. Terminating positions should be at least 1.8m from an oil storage
tank unless a wall with at least 30 minutes fire resistance and
extending 300mm higher and wider than the tank is provided
between the tank and the terminating position.
• The following additional guidelines (from part L Exceptions Guidance
Document) are recommended when determining the flue outlet
position:
• Avoid discharging flue gases into car ports or narrow passageways.
• *Minimum distance of the flue terminal from above ground is
2100mm where directed to a public footpath, private access route
or a frequently used area and 2500mm from a car parking area.
• **Recommended minimum distance of the flue terminal to a facing
wall, fence, building or property boundary is 2500mm.
Greenstar Heatslave II External
ErP -
6 720 813 345 (2014/09)
F
I
H
E
Terminal position
C, D
B
A
F
G
• Terminals should be positioned so as to avoid products of
combustion accumulating in stagnant pockets around the building or
entering into buildings.
• The flue must be fitted and terminated in accordance with the
recommendations of BS5410.
• The flue must not cause an obstruction.
• Discharge from the flue outlet must not be a nuisance.
• Flue gases have a tendency to plume and in certain weather
conditions a white plume of condensation will be discharged from the
flue outlet which could be regarded as a nuisance, for example, near
security lighting.
• There should be no restriction preventing the clearance of
combustion products from the terminal.
• The air inlet/outlet duct and the terminal of the boiler must not be
closer than 25mm to any combustible material. Detailed
recommendations on protection of combustible materials are given
in BS 5410:1
• A protective stainless steel terminal guard, must be fitted if the
terminal is 2m or less above a surface where people have access.
– The guard must be spaced equally (minimum 50mm) around the
flue and fixed with plated screws.
– See 'Contact Information' on the back cover for flue guard
information.
Pre-Installation
J
F
K
6720809437-30.1Wo
Balanced horizontal flue
600mm
600mm
75mm
600mm
300mm
300mm
300mm*
600mm**
1200mm**
1500mm
15
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