30
Flue System and
Air Supply
9 Flue System and Air Supply
9.1 Air Supply
A sufficient permanent air supply to the
boiler should be provided for the
following reasons:
• For proper combustion of fuel and
effective discharge of combustion
p
roducts to the open air.
• For the ventilation of any confined
space in which the boiler is installed
to prevent overheating of the
boiler any equipment in and near the
boiler.
It should be both the designer’s and
installer’s concern that the air required
for these functions be introduced so as
to cause as little discomfort as possible
to the building occupants and thus to
offer them the least temptation to
obstruct the ventilators.
Further details may be obtained from
BS 5410:1:1997.
For a boiler fitted in a compartment,
which is ventilated as shown, no
additional allowance is necessary.
Open flue - Extract fans, where needed,
should be in accordance with
Section 4.4 in BS 5410 Part 1 1997.
All ventilation areas given are for
domestic applications. For all other
cases refer to BS 5410 Part 2 1978.
Figure 9-1: Air supply for room sealed balanced flue boilers
Figure 9-2: Air supply for conventional flue boilers
Vortex Eco Wall-hung boilers - Ventilation areas
Output 12/16 kW 16/21 kW
Area cm
2
in
2
cm
2
in
2
Vent A 83 13 116 18
Vent B 165 26 231 36
Vent C 83 13 116 18
Vent D 165 26 231 36
Vent E 248 38 347 54
Room sealed balanced flue no
v
entilation required to room
Conventional open flue Conventional open flue
compartment ventilation from room
Conventional open flue
compartment ventilation from outside
R
oom sealed balanced flue
compartment ventilation from outside
Room sealed balanced flue
c
ompartment ventilation from room
B
B
A
C
C
D
E
C
D
A
!
NOTE
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