Crystal Glazing Limited is a multi-purposed Company involved in the manufacturing of UPVC Doors and Windows Systems. .TYPES OF PROJECTS. Crystal Glazing Limited has its target group in the manufacturing, installation and commissioning of UPVC systems for the following types of buildings. a) Housing - Multi-Storey and low rise developments. b) Health - Hospitals, Health Centres and Clinics. c) Educational - Schools and Universities. d) Commercial - Multi-Storey Offices, Shops and Indoor Shopping Centres. e) Religious - Churches and Mosques ..DOORS AND WINDOWS SYSTEM.. * Sliding doors. * Sliding windows. * Hinge Door. * Casement windows. * Tilt and turn windows. * Projector windows..