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Mounting basics
CAUTION
50 mm
20 mm
BSKM 1025
18 | EN
4 2
Necessary tools
– Angle grinder with metal separating disc
– Knife
– Metal file
– Metal drill bit
– Drill with masonry/concrete bit
– Battery-operated screwdriver
– Screwdrivers, flat, Philips and Torx
– Wrench set
– Tape measure
– Spirit level
4 3
Shortening ducts
We recommend shortening the BSKM fire protection ducts with an angle
grinder. Band saws or coping saws are also suitable.
Risk of injury from sharp metal edges!
When cutting or sawing the fire protection ducts, sharp edges may occur,
which can cause cuts. Deburr all the cut edges carefully with a metal file.
The noticeable smell, caused during cutting, is not hazardous. If neces-
sary, carry out the cutting operation in a well-ventilated location.
When cutting with an angle grinder, it may occur that the fire protection
material swells up slightly at the cut edge. This does not impair the fire
protection properties of the duct. Cut the swelled-up material as thinly as
possible with a knife.
On uncut fire protection ducts, there are two holes in the bottom sides of
both ends of the ducts. During mounting on the support systems, these
are used to screw the duct to a support profile or a lock plate (see "6
Mounting on a support system" on page 38). If the shortened duct is to
be mounted on a lock plate, then these holes must be re-drilled at the end
of the duct after shortening (see FigFig. 12).
20 mm
Fig 12: Spacing of the duct fastening holes (Ø 6 mm)
30 mm
BSKM 0711
22.5 mm
20 mm
BSKM 0407
OBO Bettermann
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