The HST door is well suited for up to 6 m wide openings, that require a lot of glass space with minimal visual obstructions. It is a comfortable solution, because it utilizes large window panes, which provide large unobtrusive glass surfaces with a great view. Ball bearings make sliding the movable casement easy. The fixed and the movable casements are installed separately on two levels. The design is suitable for large passageways.

HST
 
HST

Scheme A

The door comprises of 2 large parts. One is fixed and the other, movable, part can be move parallel to the fixed part.

Scheme C

The door is comprised of 4 part. 2 are fixed and 2 are movable. The 2 parts in the middle can be moved parallel to the fixed respective parts in the sides.

Scheme D

Scheme F

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