The ST1 by 4B is a wood/aluminium lift and slide door that has been developed from the ground up, and combines superb design with cutting edge technology. The door is characterised by smooth running, maximum light transmittance, ease of use and optimum thermal insulation. Its sleek design allows up to 10% more light in the room. Another novel feature is the innovative, completely flat threshold, with its smooth and barrier-free transition between the interior and the exterior creating a positive sense of space. The door also features a roller system with a special new design which has reduced rolling resistance by 30%. A security fitting comes as standard, and guarantees a high level of resistance against forceful opening, for example attempted break-ins. Thanks to the 4B soft close mechanism, the ST1 is the first sliding door that stops and closes by itself (as per self-closing drawers). The MINERGIE-P®certified ST1 has achieved maximum ratings with regard to thermal insulation, air permeability, water penetration resistance and wind resistance. A motorised version of the ST1 is also available. The technological edge of the ST1 is evidenced in numerous patent applications.