6
Flue Appliance Outlet Positions
Point where flue passes through
weather surface (Notes 1,2)
Clearances to flue outlet
A
at or within 600mm
of the ridge.
at least 600mm
above the ridge.
B
elsewhere on a roof
(weather pitched or flat)
at least 2300mm horizontally from
the nearest point on the weather
surface and:
a)
at least 1000mm above the
highest point of intersection
of the chimney and the
weather surface; or
b)
At least as high as the ridge.
C
below (on a pitched roof) or
within 2300mm horizon-
tally to an openable roof-
light, dormer window or
other opening. (Note 3)
At least 1000mm above the top of
the opening.
D
within 2300mm of an adjoin-
ing or adjacent building,
whether or not beyond the
boundary. (Note 3)
at least 600mm above the adjacent
building.
Notes
1)
The weather surface is the building external surface, such as its
roof, tiles or external walls.
2)
A flat roof has a pitch less than 10
o
.
3)
The clearances given for A and B, as appropriate, will also apply.
The datum for vertical
measurements is the
point of discharge of
the flue, or 150mm
above the insulation,
whichever is the lower
Datum for
vertical
measure-
ments
Datum for
horizontal
measurements
max
150mm
With acknowledgement to Building Regulations Document J
Diagram 1
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