OZONE’s new concealed door closers are fire-rated. The CDC 3800 is a concealed rack & pinion door closer with closing force of EN 3, hydraulically controlled with adjustable closing speed in two independent ranges. It is suited for doors weighing up to 60kg, andthickness 35mm. The CDC-4800, another rack & pinion closer, is suited for up to 100kg doors and 50mm thickness. The CDC–CA-6800 is a cam action concealed door closer with adjustable closing force EN 2-4. It is suited for door weight up to 80kg and tested as per EN 1154 for functionality. These door closers are fire tested and certified by Warrington Fire Research Consultancy.