This series has its origins in the “Universal Range”, which was introduced for the first time in 1912 by the british company “The Steel Manufacturing Co. Ltd.”. The Universal range consisted of three different ranges of profiles, identical in geometry and types, but different in their depth, that classified them into large, medium and small. Depending on the dimensions of the window, the most appropriate series was selected from the static point of view. These three ranges were able to cover any type of window, and in combination with special T-profiles, used as mullions and transoms, for the first time it was also possible to realize curtain walls of any size.
The currently available rage was revised in 1964 and re-coded as “W20”. The three separate ranges were condensed to one medium range, which consisted of 20 profiles able to cover the needs of new windows as well as replace those in historic buildings. Over the decades, some profiles have been abandoned and some new ones have been added, making the range more and more versatile. The depth of the profiles 32 and 37 mm, allows to manufacture various types of openings in different styles, both with single glazing or double glazing with a maximum thickness of 21 mm. Even today, this series is still chosen for a great number of restoration projects worldwide, where the superintendence asks for the original design and proportions of the relevant epoch.
Elegant and Timeless -
the bedrock of steel windows
Solid hot rolled steel profiles
“Stepped leg” design
Material thickness up to 5 mm
Very compact profiles with minimal depth and sightlines
Self-adhesive non-shrinking gaskets
Low emissivity double-glazing up to 21 mm
Choice of different glazing beads
Appropriate for heavy-duty corrosion protection
Features of W20
The basic style of the W20 range was inspired by the “SMW” (Standard Windows Metal)
range, which was proposed on the market immediately after the First World War 1914-1918. In this revised version, the depth of the profiles has been increased by 7 mm to be able to accommodate glasses with higher thicknesses.
Thanks to its simple and slender design, W20’s basic style expresses an unparalleled elegance, earning a permanent presence in projects looking for a minimalist design. In most cases this type of window is requested in combination with small T muntin bars of only 23 or 29 mm width to divide the glass in smaller panes, which replicate the typical industrial windows.
Originally, the W20 range had been developed for commercial and industrial applications. In recent decades, it has been rediscovered for contemporary residential architecture in milder climatic zones. The somatic marker of this classic suite is the “stepped” design of the flanges. This detail confers windows nice proportions and shadow lines and allows to achieve a glass pane planarity between fixed and operable windows.
A strong point of steel is the ability to be curved into any shape or geometric form and then to be transformed into a window. However, there is no quality more readily associated with steel windows and doors than narrow sightlines. For extremely slender requirements, the W20 range offers as well a slim casement line, which allows to further lighten the visual impact of the frames.