Porotherm lintels are available with our system. External and internal lintels with the special clay shells, concrete fills with the reinforced steel helps to make a perfect lintel above openings. Coming precasted in quarter meters from the factory. Available sizes (length): 1m, 1.25m, 1.5m, 1.75m, 2m, 2.25m, 2.5m. Every lintels need 150mm bearing each side. For example: 1m lintel need 300mm bearing, so it is suitable for 700mm or smaller openings.