Rabel 28 is a hinged system based on a 35mm frame primarily used to fabricate louver doors and windows. It is the most narrow louver available. The louver blades can be fixed or adjustable via a lever handle or a rotary operator. The adjustable louver blade socket is made out of polycarbonate material to ensure long life against direct sunlight and the sealing is via rubber gaskets. A standard Cremona handle in matching colours and multiple point locking system is provided as standard.