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GB
Chimney Opening:
- Chimney operation should not be hindered by the roof.
- In the event of a roof slope of 23° or less, the chimney-
opening should extend 0.5 metre above the roof surface.
- The height should be determined using the graph in Figure 2
(minimum of 0.5 metre) if the roof slope is greater than 23°.
Chimney openings
0,5
23
Alpha (degrees)
"a" if the horizontal distance between the center of the chimney-
opening to the highest part of the roof in metres.
"Alpha" is the roof slope through which the flue in question
was cut, in degrees.
"H" is the height of the chimney-opening above the roof surface
in metres.
GB 8
RIGHT
fig. 2
WRONG
Reduced diameter due to
the pipe being inserted
too far.
Back-draught due to
exhaust pipe connections
directly opposite one
another.
Draught due open doors
in extinguished stoves.
Draught from open flue
connection.
Draught from an
inadequately sealed pipe
connection.
Draught from an open
inspection hatch.
fig. 3
GB
GB 9
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