Fire-rated steel doors are not commodity products. In the UK, specifiers, contractors and building control teams expect a clear trail of evidence covering the full doorset. 

Portamet’s fire-rated steel door content already references testing routes such as BS 476 Part 22 and EN 1634-1, and this is exactly the kind of language UK buyers look for when comparing suppliers.

It is also important to align the page with the direction of Approved Document B and the broader UK regulatory environment. 

Current guidance confirms that CE marking continues to be accepted for construction products placed on the GB market, while UKCA can also be used; in Northern Ireland, CE or CE plus UK(NI) remains the relevant route. 

For external pedestrian doorsets claiming fire performance, EN 16034 together with EN 14351-1 is central to the conformity landscape.

• hot-rolled steel profile
• solid steel sections, 3–5 mm
• glazing compatibility up to 31 mm
• broad choice of glazing beads and fittings
• multiple opening types
• natural steel, RAL and custom finishes

Ottostumm FerroFinestra W40 is a steel window and door system designed to preserve the character of classic steel fenestration while meeting contemporary architectural expectations. 

The official W40 system features include hot-rolled steel profiles, solid sections with a thickness from 3 to 5 mm, compatibility with glazing up to 31 mm and a wide range of opening types including side-hung, top-hung, bottom-hung, tilt-and-turn, pivoting, sliding and folding solutions.

This makes W40 particularly attractive for architects and clients who want three things at once: a refined steel aesthetic, strong structural performance and flexibility across heritage, residential and commercial applications. It is especially suitable where the visual weight of the frame matters just as much as the engineering behind it.

Authentic hot-rolled steel character 

W40 is built around solid hot-rolled steel profiles with thicknesses from 3 to 5 mm, giving the system its unmistakable material depth and structural confidence. 

Slim steel frames with architectural strength 

Official W40 documentation emphasizes minimalistic frames and large openings, making the system suitable wherever daylight, proportion, and elegant frame geometry matter. 

Broad opening flexibility 

The official system supports side-hung, bottom-hung, top-hung, tilt-and-turn, pivoting, sliding, and folding openings, making it suitable for windows, glazed doors, and interior partitions across multiple design programs. 

Crafted by a steel windows manufacturer, not a reseller 

Portamet manufactures custom steel windows and doors in Poland and positions itself as serving architects, developers, contractors, and homeowners across Central and Eastern Europe and the USA.

W40 works well in listed or character-led refurbishments, premium residential projects, office partitions, glazed internal screens and bespoke steel door compositions. Official Ottostumm case studies show the system used in both commercial and contemporary architectural environments, which is exactly why it performs so well in specification-led projects.

For the UK market, fire performance is often part of the enquiry from the start. Portamet therefore supports projects requiring bespoke glazed steel doors in FD30 and FD60 rated configurations, while the official Ottostumm W40 Fire system is presented with fire protection classes from E30 to E60 and from EW30 to EW60. As always in the UK, the relevant point is not the frame name alone but the tested and certified doorset configuration, including glazing, seals, hardware and installation method.