"Videoprojector 22.6-113.7cm arm 13kgs max weight"
I thought I could put it at around 30cm, it is not so ... The minimum height is 58.3cm (22.6cm announced for it makes a difference sacred!)
Ceiling Distance: 58.3 cm to 110.8 cm (23 "to 43.6")
See edict of 22.10.2014