Connection Of The Oven To The Chimney; Chimney Cowl - Bronpi SIERRA Instructions D'installation, D'utilisation Et D'entretien

All ovens that send smoke to the exterior should have their own chimney.
Never use the same chimney for several equipments at the
same time (see drawings D19 and D20).
The minimum diameter must be 4 dm2 (for example, 20 x 20 cm) for
chimneys with a diameter below 200 mm or 6.25 dm2 (for example, 25 x
25 cm) for equipments with a diameter higher than 200 mm.
A big section of the chimney (for example, diameter of the pipe superior
to the one recommended) may results in a volume too large to be heated
and, therefore, it can cause difficulties for the proper operation of the
equipment. In order to avoid this problem, it is necessary to enclose
the chimney in its entire length. However, a small section (for example,
diameter of the pipe inferior to the one recommended) may cause a
reduction of the draught.
The flue must be away from flammable or combustible materials
through an appropriate insulation or an air chamber. In the case that
they pass through flammable materials compounds, they should be
eliminated.
Inside, it is forbidden that there are pipes of installations or air
abduction channels. It is also prohibited to do mobile or fixed
openings for connecting other different equipments..
If we use metallic pipes inside a masonry duct, it is essential that
they are well insulated and with appropriate materials (insulating fibre
coatings) in order to avoid the deterioration of the masonry or the
interior coating.
D21
(1) In the case that there are chimneys placed side by side,
one of them must exceed to the other at least 50 cm in order
to avoid pressure movements among them
5.1.

CONNECTION OF THE OVEN TO THE CHIMNEY

The connection to the oven for the smoke evacuation must be done with rigid aluminized steel pipes or stainless steel pipes.
It is forbidden the use of flexible metallic pipes or fibre cement pipes because they damage the safety of the connection because they
are subject to jerks and breaks, which causes smoke looses.
The chimney must be fixed hermetical to the smoke outlet of the oven. It should be rectilinear and with a material that supports high
temperatures (minimum 400ºC). It can have a maximum inclination of 45° whereby excessive deposits of condensation produced in the initial
stages of ignition and / or excessive soot formation is avoided. Moreover, it avoids the slowing down of the smoke when it comes out.
The lack of sealing of the connection may cause the malfunction of the equipment.
The internal diameter of the connection pipe should correspond to the external diameter of the chimney of the equipment. This service is
assured by the pipes complying with DIN DIN 1298.
5.2.

CHIMNEY COWL

The chimney draught also depends on the chimney cowl.
The chimney cowl should assure the smoke discharge even during windy days, having into account that it must exceed the top of the roof
(drawing D23).
The chimney cowl must comply with the following requirements:
• It must have the same interior section of the chimney.
• It must have a usable exit section that is two times the one of the interior of the chimney.
• It must be constructed so that the rain, snow or any other objet do not enter inside.
• It must be easily accessible in order to do servicing and cleaning tasks.
It the chimney cowl is metallic, due to its own design adapted to the diameter of the pipe, the smoke discharge is assured. There are different
models of metallic chimney cowl, fixed, anti-return, and rotary or extractor.
INSTALLATION, OPERATING AND SERVICING INSTRUCTIONS
D19
(1) The chimney can't have obstacles around 10 m towards
walls or trees. Otherwise, raise it at least 1 m above the
obstacle.
The chimney must exceed the top of the roof 1 m at least.
19
D20
D22
OVENS