6
Mary
Roof
slope
(α)
(α) (α)
(α)
Distance A H
15° 1.00 m
30° 1.30 m
45° 2.00 m
60°
More than 1.85 m
2.60 m
2.5 Advice on flues and connections
Flues must be made from suitable materials and perfectly insulated, with characteristics that prevent
temperature decreases.
The inner walls must be perfectly smooth without any narrowing or protrusions along the entire length, so as not
to create friction or vortices in the smoke which could cause a considerable reduction in draught.
Any cleaning and inspection doors must be perfectly closed during operation.
The flue outlets must be 0.5 m higher than any obstacles located less than 10 m away and must end with
chimney caps or cowls having a useful outlet cross section of at least double that of the flue.
The following two figures give the data regarding the distances and positioning of chimney caps in conformity
with the provisions of UNI 10683/98.
Obstacle
Less than 5 m
Min 0.5m
Min 0.5m
The chimney outlet must be at least
0.5 m higher than any obstacle
within a radius of 10 m.
fig 2b Chimney cap positioning and distances
UNI 10683/98 tables
Before connecting stove to an existing chimney, in addition to complying with that described above, make sure
there are no openings or cracks
where air could enter and cause a
temperature decrease affecting the
draught.
Also make sure there are no
hindrances caused by foreign
bodies or a build-up of soot.
The first connection section leaving
the stove should be vertical,
whereas the flue connection to the
chimney (which goes to the chimney
cap) must only enter by a few cm,
so as not to reduce the cross
section of the flue.
If the flue is not perpendicular to the
chimney it is advisable to make the connection with special steel fittings
that allow a maximum slope of 45°.
Roof
slope
(α)
(α) (α)
(α)
Distance B H
15° 0.50 m
30° 0.50 m
45° 0.50 m
60°
Less than 1.85 m
0.50 m
NO
NO
fig 2a Chimney cap positioning and
distances
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