Nordpeis N-27 Manuel D'installation page 12

Recessing the insert
When recessing the insert, adjacent walls that are not classed as fi re walls or are considered unsuitable for heat
loads must be protected by non-combustible material according to the specifi cation below.
All joints on the non-combustible material must be sealed using the manufacture's recommended method. The area
between the insert and the recess must be ventilated according to the specifi cation/dimension diagrams on page
15. When top connecting a steel fl ue please refer to the relevant manufacturer's installation instructions. Observe
the safety distances to combustible material that steel fl ues require. Heat radiation from the hatch is strong and
is why combustible material must not be placed closer than 1.5 m in front of the hatch. When recessing, 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 coeffi cient λ may 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
Sealing
If the recess is to extend to the ceiling, a seal must be made 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 the fl oor and the bottom of the insert, up to or on the sides of the recess. The
vent
must be positioned above the insert's highest point up to or to the sides of the recess.
Observe the minimum distance up to the ceiling (see diagram on page 15).
Convection air in: 600 cm²
Convection air out: 600 cm²
To service the hatch's runners, all recess parts built out in front of the moulding below the hatch, e.g. shelves, must
be removable. Note that building regulations apply regarding the area below and in front of the insert, see section
"Hearth plate".
12
GB