20
7.0 Site Requirements
© Baxi Heating UK Ltd 2016
7.8
Flue
NOTE:
Due to the nature of the boiler a plume of water
vapour will be discharged from the flue. This should be
taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements
for siting balanced flue terminals. For GB recommendations
are given in BS 5440 Pt 1. For IE recommendations are given
in the current edition of I.S. 813 “Domestic Gas
Installations”.
2. If the terminal discharges onto a pathway or passageway,
check that combustion products will not cause a nuisance
and that the terminal will not obstruct the passageway.
3.
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.
IMPORTANT:
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.
*4. Reduction to the boundary is possible down to 25mm
but flue deflector part no. 5111068 must be used.
N
I
I
G
F
M
I
A
A
F
H
J,
K
D
E
H
Li
ke
l
y
f
l
ue
p
o
s
i
t
io
ns
requ
i
r
i
ng
a
f
l
ue
term
i
na
l
guard
C
R
A
I
J,
K
I
L
S
B
T
U
Fig. 12
Fig. 11
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
Terminal Position with Minimum Distance (Fig. 12)
(mm)
A1 Directly below an opening, air brick, opening
windows, etc.
300
B1 Above an opening, air brick, opening window etc.
300
C1 Horizontally to an opening, air brick, opening window etc.
300
D2 Below gutters, soil pipes or drain pipes.
25 (75)
E2 Below eaves.
25 (200)
F2 Below balconies or car port roof.
25 (200)
G2 From a vertical drain pipe or soil pipe.
25 (150)
H2 From an internal or external corner.
25 (300)
I
Above ground, roof or balcony level.
300
J
From a surface or boundary line facing a terminal.
600
K
From a terminal facing a terminal (Horizontal flue).
1200
From a terminal facing a terminal (Vertical flue).
600
L
From an opening in carport (e.g. door, window)
into the dwelling.
1200
M
Vertically from a terminal on the same wall.
1500
N
Horizontally from a terminal on the same wall.
300
R
From adjacent wall to flue (vertical only).
300
S
From an adjacent opening window (vertical only).
1000
T
Adjacent to windows or openings on pitched and flat roofs
600
U
Below windows or openings on pitched roofs
2000
Opening Window
or Door
150mm
MIN.
IMPORTANT:
If fitting a Plume
Displacement Flue Kit, the air inlet
must be a minimum of 150mm
from any opening windows or
doors (see Fig. 13).
Plume
Displacement Kit
Air Inlet
Fig. 13
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
25mm clearance is allowed per installation. If one of the dimensions
D, E, F, G or H is 25mm then the remainder
MUST
be as shown in brackets, in
accordance with B.S.5440-1.
NOTE:
The distance from a fanned draught appliance terminal
installed parallel to a boundary may not be less than 300mm in
accordance with the diagram below
*
