Manhole Manhole opening is driven by one handle and two gas spring that allow the skylight to remain opened even if there's headwind.
Manual Opening Manual opening is driven by a mechanical device that works by a double effect worm-screw, of 30 cm path, driven by removable bar.
Electric opening Electric opening is driven by actuators at 230V, with path of 20 or 30 cm.
All devices have double framed, hinged: one fixed and other one that can be opened. They are made by particular profiles in anodized aluminium, natural gray coloured, extruded basing on our project in 6060 alloy UNI3569. They have also fittings for fixing and gaskets for withstanding atmospheric agents, air and dust.