Net (1) movable between a fully open position and a fully closed position to apertures (2) comprising parts (11) arc recesses, bevelled or similar parts, characterized by comprising a network (100) having one end (position 9) integrated fixed with a first portion (8) of a frame (10) delimiting said opening (2) and a movable end (5) associated with a pole (3) mobile vertical associated hollow, slidably, to a first guide (13) and houses a rod (14) vertically slidable whose end (15) than is associated, slidingly, a second guide (16) and supports a cable (21) suitable tensioned to extend inside said post (3) and movable within said second guide (16) until fixed to means (25) fixed compensation voltage whose end is integral with a second part (12) of the frame (10).
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