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F
. 2
ig
A
B
C
Regulated building
Point Where flue passes through
weather surface (Notes 1, 2)
A
At or within 600 mm of the ridge
B
Elsewhere on a roof (whether pitched
or flat)
C
Below (on a pitched roof) or within
2300 mm horizontally to an openable
rooflight, dormer window or other
opening (Note 3)
D
Within 2300 mm of an adjoining
or adjacent building wether or not
beyond the boundary (Note 4)
Notes
1.
The weather surface is the building external surface, such as its roof, tiles or external walls.
2.
A flat roofs has a pitch less than 10°
3.
The clearances given for A or B, as appropriate, will also apply.
4.
A vertical flue fixed to an outside wall should be treated as equivalent to an inside flue emerging at the nearest edge of the roof.
F
. 3
ig
Outlet should be above the
shaded areas
where flue discharges in proximity to roofs with surfaces readily ignitable, such as where roofs are covered in thatch or shingles.
The use of counter slope elements is forbidden. The flue union must have a constant section and allow soot to be collected and swept
away. Changes in cross-section are only allowed at the outlet of the heat generator: the use of adaptors on the coupling with the chimney
flue is prohibited.
Running other air ducts and installation pipes inside the exhaust pipes, even if oversized, is forbidden.
In the event of a black-out, suitable sizing of the fume exhaust system guarantees sufficient draught to exhaust the fumes generated by
combustion without the use of the electric exhaust fan.
If the performance of the fume exhaust system is not excellent, it is possible to adjust the operating settings of the stove to overcome
draught defects by a maximum of 15% of the fume exhaust device; this adjustment is however the exclusive competence of the Technical
Assistance Centre CAT.
One airtight reading point is recommended on the flue to check emissions after installation and measure draught.
24
D
Adjacent building
Clearances to flue outlet
At least 600 mm above the ridge
At least 2300 mm horizontally from the nearest point on the weather surface and:
a)
at least 1000 mm above the highest point of intersection of the chimney and the weather surface; or
b)
at least as high as the ridge
At least 1000 mm above the top of the opening
At least 600 mm above any part of the adjacent building within 2300 mm.
east
mm
150 mm
max.
The datum for vertical measurments is
the point of discharge of the flue, or 150
mm above the insulation, whichever is
the lower
Area
Location of flue outlet
A
At least 1800 mm vertically above the weather surface and
at least 600 mm above the ridge.
B
At least 1800 mm vertically above the weather surface and
at least 2300 mm horizontally from the weather surface.
Datum for
horizontal
measurments
Datum for
vertical
measurments
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