OBO Bettermann
76 | EN
Mounting variants
10 2 2
Wall penetration larger than the duct opening
For fire resistance classes I30–I120:
With the wall end variant, the duct ends within the wall. Seal both the
duct end
1
and the wall penetration of the cables
2
using approved
insulation, e.g. through PYROPLATE
®
Fibre or PYROPLUG
®
Block. Seal
the cavity in the wall around the duct end
3
using mineral wool (mineral
wool insulation, material class A1, melting point > 1,000 °C, e.g. OBO
MIW), and push as much as possible into the gap, for example with a
stick, in order to achieve as high a density as possible. Finally, seal the
mineral wool with a layer of filler
4
(min. thickness: 2 mm).
BSKM 0407
max. 350 mm
BSKM 0407
max. 350 mm
1
2
3
4
Fig 73:
Wall end cover within the wall for BSKM 0407
To achieve the fire resistance class I120, you should additionally mount a
wall end cover fitting
5
(direct mounting: see “5.6.6 Mounting a reducer”
on page 36, support system mounting: see “6.3.8 Mounting a wall/ceil-
ing penetration” on page 62).
Fig 74:
BSKM 0711/1025
max. 1 m
BSKM 0711/1025
max. 1 m
1
2
3
4
5
Wall end cover within the wall for BSKM 0711 and BSKM 1025
For fire resistance classes I30:
For this, create the wall end cover as described above, but do not use the
insulation in the duct end
1
and do not use the wall end cover fitting
5
.
