Guide Tubes (Artira)

From Garaventapedia

The Artira Platform travels on two steel tubes, 51mm (2") in diameter, that are affixed 600mm (23 5/8") apart vertically. The location of the tubes on the stairs depends on the platform size and the angle of the stairs. Generally speaking, the lower tube is approximately 500mm (21 5/8") vertically above the stairs when a 800 x 1220 mm (31 1/2" x 48") platform is used.