Nordica ROSA Instruction Pour L'installation, L'utilisation Et Entretien page 22

5.1. CHIMNEY CAP POSITION
The draught of the flue depends also on the suitability of the chimney cap.
Therefore, if it is handicraft constructed, the output section must be more than twice as big as the internal
section of the flue.
Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in
case of windy weather (Picture 4).
(1)
Industrial chimney
cap with pre-fabricated
elements – it allows an
excellent discharge of the
smokes.
The chimney cap must meet the following requirements:
• have internal section equivalent to that of the stack.
• have a useful output section twice as big as the flue internal one.
• be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in
the flue.
• be easily checkable, for any possible maintenance and cleaning operation.
50 cm
2 m
1
m
22
(2)
cap. The right output
section must be at least
twice as big as the
internal section of the flue
(ideal value: 2.5 times).
10 m
(1)
from walls, pitches and trees. Otherwise raise it of at least 1 m
over the hindrance.
The chimney cap must exceed the ridge of the roof of at least
1 m.
Handicraft chimney
(1) In case of flues side by side, a chimney cap
must be higher than the other one of at least 50
cm in order to avoid pressure transfers
between the flues themselves.
The chimney cap must not show hindrances within 10 m
ROSA - ROSETTA
(3)
Chimney cap for steel
flue with conical deflector
of smokes
Picture 4
Picture 5
Picture 6
1095080 – Rev.05 – EN