The FerroFinestra W40 is an evolution of the famous W20 range developed in 1964. Produced for the first time in 1995, it consists of 17 hot rolled profiles and follows the flawless design of its predecessor. Though, it comes with a key upgrade. An increased profile depth, which allows accommodating double-glazing up to a thickness of 27mm. The W40 is also highly acclaimed in modern era architecture for its elegant and compact sightlines. Ensures safety and comfort thanks to its excellent thermal and acoustic performance. Despite the 42 to 47 mm depth, it is considered a “heavy duty” range, which allows making tall and expansive windows.