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7.0 Site Requirements - Page 14
7.9 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.
Recommendations for flues are given in BS 5440 Pt.1.
2. If the terminal is fitted within 1 metre (39 in) of a plastic
gutter, within 500mm (19½in) of a painted eave or a painted
gutter, an aluminium shield of at least 1 metre (39 in) long
should be fitted to the underside of the gutter or painted
surface. An air space of 5mm (
shield and gutter (Fig. 16).
3. 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.
4. Take into consideration the effect the plume of vapour
may have on neighbours when siting the flue.
5. If a terminal is less than 2 metres (78
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 (Fig.17)
A
Directly below an openable window or other
opening, e.g. an air brick.
B
Below gutters, soil pipes or drain pipes.
C
Below eaves.
D
Below balconies or car port roof.
E
From vertical drain pipes and soil pipes.
F
From internal or external corners.
G
Above ground, roof or balcony level.
H
From a Surface facing a terminal.
I
From a terminal facing a terminal.
J
Vertically from a terminal on the same wall.
K
Horizontally from a terminal on the same wall.
L
For an opening in a car port (e.g. door, window)
into a dwelling.
3
/
in) should be left between
16
3
/
in) above a
4
(mm)
300
75
200
200
75
300
300
600
1200
1500
300
1200
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