- Aluminium insect screening system suitable both for windows and doors. The fibreglass mesh is electronically welded at sides (standard). This model is always supplied with Telescopic rails; alternatively, by request, standard rails are available. Chain driven system, that lets you choose the position in which you prefer to stop the insect screen. Standard single chain on the right (inside view); by request we can supply double chain system (inside and outside chain). 50 mm rounded Roller box available.