The sliding ladder is counterbalanced by counterweights in a post that is parallel to the ladder upright. On release, the ladder descends softly. Remounting the ladder afterwards requires a very limited force ("one finger").
Release of the sliding part is possible from above, from below or from side with 3/4 safety cage on the top part of the ladder.
The maximum clearance height is 3m. The counterbalanced ladder has a length equal to the clearance height plus 84cm (or 3 rungs).