Four versions:up to 4m (WIL4, WIL4I),up to 6m (WIL6, WIL6I)Galvanised steel, painted caseor AISI 304 (WIL4I, WIL6I )Incorporated control unit, can be removed,making wiring and maintenance easierEasy to install: the bar can be assembledon either the right or left hand side indifferentlyEasy to balance: linear adjustmentof the springThe system will operate duringa blackout by means of internally fitted,rechargeable batteries.The limit switches for slowdown duringboth opening and closing can be adjustedboth mechanically and electronically