The systems allow the installation of over-curtains with partial or total overlap and of under-curtains with central or lateral opening. The 305 system differs due to the possibility of fitting the pelmets and vertical blinds fixed using velcro© on a special front section. Independent cord operating for over-curtains and under-curtains (or by hand). For use with curtains 600 cm w max. and 300 cm h, weighing not more than 6 kg for each curtain pair. The fabric opening can be central, lateral, multiple and asymmetric. Ceiling or wall installation with overhanging brackets. The operating cords run in independent side-by-side channels. Sliding is guaranteed by self-lubricating polyethylene slides or by acetylic rollers for curtains at the load limit.