ToughLITE 500mm Cornice Ventilation. Ideally suited for high-risk areas like cell environments where the occupier is left on their own. Designed to be ligature resisting, very robust and secure. Supplied in a standalone or a full cornice version giving a wall to wall solution.  It can be provided with either side or top/rear entry. Supplied with separate air duct tray for easy cleaning. Grille has 2mm holes at 4mm pitch giving 19.6% free air movement which is suitable for use with a 100mm diameter air duct system.