Optoglas is made of 4 mm heat-treated glass with or without energy coating and is fitted using special hinges and fittings on the window frame so that the glass can be opened for cleaning. A wooden bumper rail with Q-Lon weather seal can be fitted on the inside casing to seal the window tightly on the side facing the room.
Find pictures of Optoglas Accessories.
It is important to ensure that measurements are correct when measuring for Optoglas.
Optoglas is easy to fit on existing window frames - see how.