OBO Bettermann SLM50 Mounting Instructions page 28

Mounting vertical ladders up to a max storey height of 7 0 m
Note!
WARNING
28 | EN
To connect additional ladder rails to the mounted ladder rails, see "6.5
Mounting U support connectors" on page 30.
Function loss through length expansion in the event of fire!
If there is a fire, the material of the vertical ladders expands.
Do not bolt the vertical ladder to the floor. Maintain a minimum distance
of 70 mm between the end of the ladder rail and the top side of the
lengthwise profile.
Fig 34: Moveable bearing on the floor
OBO Bettermann