System-36- U-Shaped intumescent gasket with a range of standard glazing beads. Suitable for curved corners and circular vision panels. System-630- A variant of System-36 specifically designed for cost-effectively incorporating circular glazed aperture into 60 minutes fire resistant doors. System-321- Unique clip-together glazing system, containing everything required to glaze one aperture in an FD30 Door. System-69- variant of system - 90 PLUS -specifically designed for use with doors and screens whose frame and glazing beads are made of high density mineral composite material.