24
4.4.3.
Boiler room ventilation
The boiler has sealed combustion chamber. Combustion air is not drawn from boiler room or area surrounding the boiler therefore
specific recommendations for ventilation in the area of the appliance is not required.
It is mandatory to install the boiler in an adequate room following laws and standards applicable in the country of
installation, which are considered as fully transcribed in this manual.
4.4.4. Flue
The following guidelines indicate the general requirements for siting balanced flue terminals. For GB recommendations are given in
BS 5440 Part 1. 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. 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.
TERMINAL POSITION WITh MINIMUM DISTANCE (mm)
Aa
Directly below an opening, air brick, opening windows, etc.
300
Ba
Above an opening, air brick, opening window etc.
300
Ca
Horizontally to an opening, air brick, opening window etc.
300
D
Below gutters, soil pipes or drain pipes
25
E
Below eaves.
25
F
Below balconies or car port roof.
25
G
From a vertical drain pipe or soil pipe.
25
h
From an internal or external corner.
25
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
a
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. See BS 5440 Pt. 1.
H
H
A
F
J,K
S
I
A
E
I
C
D
I
A
G
B
U
T
J,K
N
M
I
R
I
F
L
Likely flue positions requiring
a flue terminal guard
fig. 9
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