GB
102
RECESSING THE INSERT
If the recess is to extend to the ceiling, a heat shield must be positioned above the convection exhaust. This is to prevent hot air collecting
in the recess closest to the ceiling. The seal must a maximum of 100 mm above the convection exhaust’s upper edge and must be made up
of 20 mm thick building boards made of calcium silicate or a panel with at least a 50 mm thickness of rock wool on top.
Convection air
The convection air ventilates the surround, cools the insert and transports the hot air out into the room. The total sum of the effective
cross section area up and down must not be less than the stated values. The air intake must be positioned somewhere between floor level
and the bottom of the insert, at the front or on the sides of the recess. The vent must be positioned above the insert’s highest point at the
front or to the sides of the recess.
If the air intake respectively the vent is positioned on the sides, the areas for the left respectively right sides must be the same size
to ensure that the insert is evenly cooled.
Check the minimum distance to the ceiling.
Convection air in: 200 cm²
Convection air out: 200 cm²
Load bearing base
Check that the convection box is positioned on a base strong enough to bear the weight of the stove and chimney. The weight of the
chimney must not load the insert with more than 100 kg. The base must not prevent the convection air flow in the area between insert and
recess.
Recessing the insert
When recessing the insert, adjacent walls that are not classed as fire walls or are considered unsuitable for heat loads must be protected by
non-combustible material according to the specification below.
All joints on the non-combustible material must be sealed using the method recommended by the manufacturer. The area between the
insert and the recess must be ventilated according to the specification/dimension diagrams.
When top connecting a steel flue, please refer to the particular manufacturer's installation instructions. Observe the safety distance to
combustible material required by the steel flue Heat radiation from the door is strong and because of this combustible material must not be
placed closer than 1 m in front of the door. When recessing, the building material must not be in direct contact with the insert due to the
thermal expansion of the insert.
Material requirements
The building material must not be combustible.
The thermal conductivity coefficient
λ
must be a maximum of 0.14 W/mK.
The thickness of the building material must always be at least 100 mm.
In cases where the building material’s insulation properties are given as a U-Value, this must be a maximum of 1.4 W/ m²K.
List of suitable materials:
Aerated concrete:
λ
= 0.12–0.14
Vermiculite:
λ
= 0.12–0.14
Calcium silicate:
λ
= 0.09
Heat shield