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a closed position should be equal to at least 25% of the cross section of the flue gas spigot. Chimney should protrude
above the roof in accordance with applicable regulations.
Outlets of flue gas ducts must be constructed according to the following rules:
•
In case of flat roofs of roof slopes inclination angle not greater than 12°, regardless of the roof structure, the
outlets should be located at least 0.6 m above the level of the ridge or the periphery of the building in case of
recessed roofs.
•
In case of steep roofs of angle of inclination of roof slopes above 12° and the following coverings:
o
highly combustible, the outlets of ducts must be located at the height of at least 0.6 m above the level
of the ridge,
o
non-combustible, inflammable and flame retardant, the outlets of the ducts must be located at least
0.3 m from the surface of the room and within at least 1.0 m of measured surface in the horizontal
direction from this surface.
•
If a chimney is located near an element of the building that constitutes an obstacle (curtain), in order for ducts
to work properly, their outlets should be additionally located:
o
above the surface protruding at 12° angle downwards to the level of the highest obstacle (curtain) for
chimneys located within 3 to 10 m from this obstacle in case of steep roofs,
o
at least at the level of upper edge of the obstacle (curtain) in case of chimneys located within 1.5 to 3.0
m from the obstacle,
o
at least 0.3 m higher than the upper edge of the obstacle (curtain) in case of chimneys located within
1.5 m from this obstacle.
External air supply
If air supply to the house is insufficient, e.g. in houses equipped with mechanical ventilation, provide additional fresh air
supply to the chimney from outside of from the basement if it is not heated during winter. Cross section of the air supply
should constitute at least
¼
of the chimney duct surface.
Installation and commissioning
Installation and commissioning of the fireplace insert or freestanding stove must be executed by a qualified assembly
team. The device must be carefully levelled and then connected to the chimney duct, and, in case of devices with a water
jacket, also to the central heating installation. Before positioning a water stove, create a foundation of height of minimum
5 cm above the flooring of the room in which the stove is to be operated. Then, commence assembly of the equipment of
the water stove. The flue of the insert must be connected to the chimney using a steel pipe, which must be put onto the
flue and mounted in the chimney. Refilling of water in C.H. installation must be executed outside the chimney (not closer
than 1 m) on the return water line.
PLEASE NOTE!
Pay attention to the state of existing flue gas duct, many of them are obsolete or are not adjusted, they
may also be subject to fast contamination or, more often, do not withstand high temperatures reached by flue gases.
Moreover, excessive cross section of the flue gas duct may constitute a space too large to heat, which in turn may cause
disturbances in the operation of the furnace. In order to eliminate any risk, we recommend mounting pipes in the flue gas
duct (made of brick) over its entire height. The pipeline must have CSTB certification allowing its use in this type of
applications.
5. Recommendations on the housing of fireplace inserts
•
Prefabricated elements should be connected using a modelling glue and sisal.
•
Side pillars, beam and the fireplace hood must be connected via the wall on which the fireplace is based.
•
The housing should be made of inflammable materials.
•
If the beam is made of wood, it should be protected with concrete tie beam and insulation made of mineral
wool with aluminium foil. There should be an appropriate gap between the fireplace and elements that protect
the beam. Stone beams must be secured with so called extraction mounted to the beam and to the wall.
It is recommended to construct the hood using heat resistant plates reinforced with fibreglass of thickness of min. 20
mm. It is recommended to cover the interior of the hood using mineral wool with aluminium coating of min. 25 mm
thickness directed towards the interior of the fireplace. Perform the so called horizontal deflector approximately 30 cm
below the ceiling to direct the heat, emitted by the furnace, to gratings installed below the deflector. Ventilation gratings
should be located at least 30 cm from the ceiling. The construction of the air gratings must prevent their clogging. It is
forbidden to use gratings with curtains.
PLEASE NOTE! Inlet gratings should feature 40-60 cm
²
per 1 kW of fireplace insert heating power.
Outlet gratings should be 20-40% larger.