All canvas in double curtain (2 canvas side by side spaced-out of 30cm for a better sound insulation)
Height lifting by winding on 1 axis of 70mm diameter.
Steel flasks spaced and welded on the axis to guide the tapes which, when then wind around the axis, lift up the net or the curtain.
Central engine in 230V. Bearing to maintain perfectly the central axis.
Specific fixations to the framework.
The complete set on study.