The Porotherm lintels are available with our system. External and internal lintels with the special clay shells, concrete fills reinforced with 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 lintel needs to lay on 150mm bearing on each side. For example: 1m lintel need 300mm bearing and are suitable for 700mm or smaller openings.