CABINET MOUNTED LOW LEVEL
FLUE TERMINAL POSITIONS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)
14
P
R
E -
IN
ST
AL
LA
TI
O
N
Minimum dimensions of flue terminal positions for oil fired appliances:
TERMINAL POSITION B(H)
A
1
Directly below an opening, air brick, opening windows, etc 600mm
B
1
Horizontally to an opening, air brick, opening window, etc 600mm
C
Below a plastic/painted gutter, drainage pipe or eaves if 75mm
combustible material protected
D
2
Below a plastic/painted gutter, drainage pipe or eaves without 600mm
protection to combustible material
E From vertical sanitary pipework 300mm
F From an external or internal corner or from a surface or boundry 300mm
alongside the terminal
G Above ground or balcony level 300mm*
H
1
From a surface or boundary facing the terminal with 2500mm 1200mm
clearance to both sides of the terminal
H
2
From a surface or boundary facing the terminal with less than 2500mm
2500mm clearance to either side of the terminal
I
1
From a terminal facing the terminal with 2500mm clearance to 1200mm
clearance to both sides of the terminal
I
2
From a terminal facing the terminal with less than 2500mm 2500mm
clearance to either side of the terminal
K Horizontally from a terminal 750mm
B(H) Balanced Horizontal flue
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.
2 A way of providing protection of
combustible material would be to fit
a heat shield at least 750mm wide.
• Flue terminals must be positioned to avoid
combustion products 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 terminal guard must be fitted if
the terminal is 2m or less above a surface
where people have access.
Stainless steel terminal guard.
Part No: 7 716 190 050
• 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.
boundary
F
I
H
B
A
G
E
C, D
F
F
J
K
boundary
CABINET MOUNTED LOW LEVEL
FLUE TERMINAL POSITIONS
