3D Viewer


Steel casement window

Manufacturer OTTOSTUMM

The new generation of solid steel windows
FerroFinestra®, literally meaning “window iron”, stands for an accurate selection of original hot rolled steel and extruded architectural bronze window and door profiles.
Steel windows have been, and still are, the preferred choice of architects. Especially when their function is not to close a hole in a wall but a significant contribution to the character and overall appearance of a building. The minimalist aesthetics of solid hot rolled steel profiles and their ability to shape windows is unique. Their slender lines appear to lose weight and give lightness to the frames, emphasizing the transparency of a façade. This elegance is difficult to achieve with the bulky profiles of alternative materials.
Contemporary architecture is rediscovering as well the value and beauty of bronze, which was the principal performer in windows and doors of representative commercial buildings and residences of the 18th and 19th century. This noble metal emanates a warmness difficult to match with other metals.
Windows crafted from our distinctive FerroFinestra® profile ranges are ideal for historical renovation but fascinating also for new high-end residential and boutique commercial buildings. Often they become the most prominent feature in prestigious estates recalling popular architectural styles like Mediterranean, Mission Revival or Spanish Colonial. FerroFinestra® profiles are the basic components for a large variety of slender open inwards and outwards casments as well as large size sliding, by-folding and French doors.

Further details


There is no exact date of when these arrow shaped profiles were first rolled, but they date back to a period between 1890 and 1905. The name “Stucco” comes from the putty or filler used to fix the single glass in this type of windows. This gave the window an arrow effect on the inside and outside. The system was composed mainly of four hot-rolled profiles and some complementary profiles hot rolled and bent from sheet metal. The typical frames made with these profiles were for large industrial sidewall windows with horizontal pivoting openings.

Although all four original hot rolled profiles are still available, today this type of window is seldom used for outdoor applications due to its moderate coefficients of thermal insulation and water tightness. Nevertheless, thanks to its historic charm this line is often requested in areas of interior architecture. Alternatively to the putty filler a more contemporary sloped aluminum glazing bead can be used.


This series has its origins in the “Universal Range”, which was introduced for the first time in 1912 by the british company “The Crittall 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 a 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 range 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.


The classic W40 range is an evolution of the famous W20 range developed in 1964. Produced for the first time in 1995 it consists of 18 profiles and follows the unmistakable classic design of its predecessor. The strong point of this “young” series, is the increased profile depth, which allows to accommodate double glazing up to a thickness of 27mm. The W40 suite proposed by OTTOSTUMM is not only used in the field of restoration, but it’s also highly acclaimed in contemporary architecture for its elegant and compact sightlines, ensuring safety and comfort thanks to its excellent thermal and acoustic performance. Despite the depth of this system is only of 42 respectively 47 mm, technically it is considered a “heavy duty” range, which allows making large windows thanks to the extraordinary strength of steel.
Any kind of inward or outward openings: side-hung, double-vent (French style), bottom-hung, top-hung or projected top-hung, horizontally and vertically pivoted windows, as well as large sliding and folding doors.

Features of the system
1. Solid hot rolled steel profiles;
2. “Stepped leg” design;
3. Material thickness up to 5 mm;
4. Very compact profiles with minimal depth and sightlines;
5. Self-adhesive non-shrinking gaskets;
6. Low emissivity double-glazing up to 27 mm;
7. Choice of different glazing beads;
8. Appropriate for heavy-duty corrosion protection.

Related products

OTTOSTUMM Catalogues

Steel casement window FERROFINESTRA® | Window - OTTOSTUMM

Steel casement window FERROFINESTRA® | Window - OTTOSTUMM
Steel casement window FERROFINESTRA® | Window - OTTOSTUMM

Steel casement window FERROFINESTRA® | Window - OTTOSTUMM
Loading Extra News
Loading event fair
Loading product info request form