OBO Bettermann
36 | EN
Direct mounting on the ceiling, wall or floor
5 6 6
Mounting a reducer
The reducer can be used to create a reduction from the main duct to a
narrower duct. The following reductions are possible:
– 250 mm-wide duct routing (BSKM 1025) to a duct section of width
110 mm (BSKM 0711)
– 110 mm-wide duct routing (BSKM 0711) to a duct section of width
70 mm (BSKM 0407)
Mount the reducer as shown in Fig. 38.
• Attach the reducer and fix it, e.g. with four fire protection bolt ties (see
“4.1 Fastening material” on page 17).
BSKM-RE 1025
BSKM-RE 0711
BSKM 0711
BSKM 0407
BSKM 1025
BSKM 0711
Fig 38:
Mounting a reducer
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Mounting a wall/ceiling penetration
With wall or ceiling penetrations, for the achievement of the fire resist-
ance class I30–I90, it is sufficient to plug the cavities around the duct with
mineral wool and seal them with filler (see “5.5 Creating a wall/ceiling
penetration” on page 29).
However, if I120 is to be achieved, then seal both sides of the penetration
with a wall connection fitting BSKM-WA 0711 or BSKM-WA 1025 (see Fig.
39). The overlapping ensures the necessary tightness. The wall connec-
tion fitting is only available for BSKM 0711 and BSKM 1025.
The mounting example shows a wall penetration. The ceiling penetration
is mounted in essentially the same way.
