Designed to replicate a traditional crittal style window, the Aluminium ‘Heritage’ is a replacement for slim original timber and steel windows with a modern, secure and energy-efficient alternative. The slim sight-lines offered by this range are much closer to original period windows thanks to the strength and rigidity of aluminium. Even our slimmest PVCu windows are double the width of this aluminium profile which in many instances, especially on smaller windows, is unacceptable.