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5 Before installation
Key
Description
C
Horizontally to an opening, air brick,
(1)
opening window etc.
D
Below gutters, soil pipes or drain pipes
(2)
Below eaves
E
(2)
Below balconies or car port roof
F
(2)
From a vertical drain pipe or soil pipe
G
(2)
H
From an internal or external corner
(2)
I
Above ground, roof, or balcony level
(1) In addition, the terminal should be no nearer than 150 mm to an opening in the building fabric formed for the purpose of accommodating a
built-in element such as a window frame.
(2) Only ONE 25 mm clearance is allowed per installation. If one of the dimension D,E,F,G or H is 25 mm then the remainder MUST be as
shown in brackets, in accordance with BS 5440–1.
Fig.17
Property boundary
A*
2
3
30
500 System 2
If the terminal discharges onto a pathway or passageway, check that com
bustion products will not cause a nuisance and that the terminal will not
obstruct the passageway.
If a terminal is less than 2 metres above a balcony, above ground or
above a flat roof to which people have access, then a suitable terminal
guard must be provided.
1
2
3
A
*Reduction to the boundary is possible down to 25 mm but the flue
deflector must be used.
1
PN-0000457
mm
Key
Description
300
L
From an opening in carport (e.g. door,
window) into the dwelling
25 (75)
M
Vertically from a terminal on the same
wall
25 (200)
N
Horizontally from a terminal on the
same wall
25 (200)
R
From adjacent wall to flue (vertical on
ly)
25 (150)
S
From an adjacent opening window
(vertical only)
25 (300)
T
Adjacent to windows or openings on
pitched and flat roofs
300
U
Below windows or openings on pitch
ed roofs
Important
Under car ports we recommend the use of the plume displace
ment kit. The terminal position must ensure the safe and nuisance
- free dispersal of combustion products.
Property boundary line
Terminal assembly
Top view rear flue
300 mm minimum*
Important
The distance from a fanned draught appliance terminal installed
parallel to a boundary may not be less than 300 mm in
accordance with the diagram opposite.
mm
1200
1500
300
300
1000
600
2000
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