OBO Bettermann
30 | EN
Direct mounting on the ceiling, wall or floor
• When plugging the mineral wool
2
, it is advisable to use an imple-
ment such as a stick and push as much as possible into the gap, in
order to achieve as high a density as possible.
• Moisten the surface of the mineral wool slightly with water and coat
both sides with filler
4
with a thickness of min. 2 mm.
5 5 2
Wall penetration in dry/lightweight construction wall
The mounting process described below allows achievement of a fire re-
sistance class I90, depending on the fire resistance length of the wall. For
I 120, see “5.6.6 Mounting a reducer” on page 36.
BSKM 0407/0711/
1025/
BSKM 0407/0711/
1025
I30
I60
I90
5-10 mm
1
5
6
4
2
3
Fig 29:
Wall penetration through dry/lightweight construction wall
1
Ceiling
2
Mineral wool insulation, mater-
ial class A 1, melting point
> 1,000 °C, e.g. OBO MIW
3
Doubly covered, insulated
lightweight construction wall
(the opening soffit can be just
one layer)
4
Sealing with filler
5
For BSKM 1025: insert lid
supports BSKM-DS 1025
6
Gap between ducts: 5‒10 mm
• When plugging the mineral wool
2
, it is advisable to use an imple-
ment such as a stick and push as much as possible into the gap, in
order to achieve as high a density as possible.
• Moisten the surface of the mineral wool slightly with water and coat it
with filler
4
with a thickness of min. 2 mm.
