The timber frame lintel range consists of single element lintel with a sloping outer face and duplex corrosion protection, which provides built-in DPC. All timber frame models must be secured with restraint clips (not supplied) and a batten (not supplied) to prevent lateral deflection (twist) during the building stage. Duplex Corrosion Protection Suitable for Standard Duty loading applications. For use in 102 mm exterior walls. Duplex Corrosion Protection System. ANG lintels should be suitably propped and laterally restrained during construction. Standard lengths are available in increments of 150mm at lengths up to 3000mm, 300mm at 3000mm-3900mm.