01 // ST MODERN — 30 × 25 MM PROFILE, 45° CORNER
A steel system for workshops that build doors and screens to order, designed for short production times. Butt-jointed 45° corners, a glazing rebate built into the profile and cutting lists from Fenster AI.
01 // BENEFITS
Six benefits translated into what a production manager counts: material cost, labour time per unit and downtime. Where we are still collecting data, we say so plainly.
We quote the material price for your construction in reply to your enquiry, together with a schedule of profile lengths. Material usage for every following order you can work out yourself from the cutting list in Fenster AI.
PURCHASEIndicative total labour time of everyone involved in one single-leaf door with frame. This is working time, not order lead time. The scope of the measurement is in the footnote.
LABOUR TIMEFor doors with lever handles the system provides for a lock with a magnetic latch. We select the lock model and hardware with you at the quotation stage. Details in the Solutions section.
DOORS WITH LEVER HANDLESDetails for pivot and sliding doors are already developed, so you don't draw them from scratch for every order. Details in the Solutions section.
READY-MADE DETAILSOnline software for drawing constructions, quoting and generating cutting lists and glass schedules, with an AI assistant in the designer. In the production module you can also prepare a profile order for your supplier.
ONLINE SOFTWAREMechanical durability and structural stiffness: work is under way, as of October 2026. We do not declare performance characteristics before we receive the report.
IN PROGRESS* Labour hours are the total working time of everyone involved, not the lead time. Indicative value, excluding painting; full scope of the measurement in the footnote at the bottom of the page.
02 // VARIANTS
ST Modern, ST Heritage and ST Sound are built on the same ST30 leaf and differ in glass divisions, glass and accessories. ST30 is a system for interior use: doors, screens and fanlights.
A leaf made from the 30 × 25 mm profile with a minimum of divisions and a short cutting list. For doors and screens where a slim frame line and repeatable production matter.
Glass divisions inspired by early 20th-century industrial joinery. More panes do not mean more calculating: Fenster AI works out glazing bar lengths and glass sizes.
A variant prepared for acoustic glass. The result depends on the glass, threshold and seals, and the Fenster AI calculator (beta) estimates the Rw of the whole construction before you quote it.
The images above are visualisations showing what the system can do, not photographs of completed projects. We will replace them with photographs of real installations as soon as they exist.
Whether joinery is acceptable in a listed or historic building is decided by the relevant conservation authority. On request we will prepare sections and drawings for approval. The Rw from the calculator is a calculated estimate, not a test result to EN ISO 10140.
02.1 // SOLUTIONS
Pivot, sliding and magnetic-lock doors eat up time before the first cut: drawing the detail and hunting for hardware. In ST30 the details are developed, and we select the hardware with you.
The leaf turns on a pivot rather than on hinges. The detail is developed; the workshop drawing and hardware selection are prepared for the specific order. Pricing is individual.
The leaf slides on a track. The detail is developed; we choose the track type and hardware with you at the quotation stage, and you receive the workshop drawing with the quote.
The system allows for a lock with a magnetic latch operated by a lever handle. We select the lock model, handle and hardware with you when quoting.
Permissible sizes and weights of pivot and sliding leaves are given solely from the hardware manufacturer's data, with the source stated. Pivot and sliding doors in the ST30 system are not yet in the Fenster AI catalogue — drawings and quotes are prepared individually. As of October 2026.
02.2 // ST30 PROFILE
Leaf and fixed light from the ST30 profile, plus a frame, glazing bead, glazing bars and gasket matched to ST30. Dimensions are nominal until the technical data sheet is published.
TECHNICAL DATA
WHAT'S IN THE PROFILE
ST30.001 leaf: 30 × 25 mm section, 1.5 mm wall (nominal dimensions). Corner cut at 45°, butt-jointed.
The glazing rebate is part of the profile and the glass is held by a glazing bead. The bead goes on the cutting list with the profiles, so you cut it from the same schedule.
ST30.013 glazing bar — a 30 × 33 mm T-section (nominal). It divides the glass into panes in ST Heritage and goes on the cutting list like any other profile in the system.
ST30 sections are in the Fenster AI catalogue. They generate technical drawings with sections, the cutting list and the glass schedule for every construction.
03 // PRODUCTION
From cutting the profiles to a door ready for installation. Painting falls between welding and glazing and is not included in the labour hours*. Dimensions come from the Fenster AI cutting list.
Lengths and cutting angles come from the Fenster AI cutting list, calculated from the construction drawing. The dimension goes from design to saw without retyping.
You assemble the leaf and frame from profiles cut at 45° and butt-jointed, in one line. The lengths of all parts come from the same cutting list.
You weld the corner along the joint and then grind the weld. You choose the welding method to suit your workshop's equipment; the time for this step depends on it too.
After painting (not in the hours*) you set the glass in the profile rebate and fix it with a glazing bead, then fit the hardware. Glass sizes come straight from the glass schedule, so you can order the glass earlier.
* Labour hours are the total working time of everyone involved, not the lead time. Indicative value, excluding painting; full scope of the measurement in the footnote at the bottom of the page.
04 // FENSTER AI
Fenster AI is online software for joinery manufacturers. The quote, cutting list and glass schedule all come from the same drawing. Access to the software and the range of modules are agreed individually with each workshop.
Doors, screens and fanlights: dimensions, mullions, transoms, glazing bars, lock cases, handles, threshold and RAL colour. The AI assistant turns a description or a photo of a sketch into a drawing, and you check the result.
Quotes calculated from the drawing using your price list, with individual customer discounts and offer versions. Your customer receives a PDF with a drawing of each item, or a link to accept the offer online.
Lengths, 45° and 90° angles and profile quantities, plus glass sizes — all calculated from the drawing. Cutting list and glass schedule as PDFs, ready to print for the shop floor.
The materials store deducts usage from the cutting list and shows shortages. From them you create a profile order for your supplier — including us — and send it by e-mail as a PDF.
An RFID kiosk records time at workstations and the production board shows deadlines and delays. You can compare labour time with the job costing. Requires a tablet and an RFID reader.
The calculator estimates the Rw (C; Ctr) of a construction from the choice of glass, threshold and opening type, and shows which element limits the result. An indicative calculated estimate; not a test result.
What AI does and what the algorithm does: lengths and glass sizes are calculated by an algorithm from the construction geometry, and prices from your price list — not by a language model. AI works as an assistant in the designer and, in the production module, helps analyse data and read delivery notes. You check and approve its output. Instructions, sketches and documents passed to AI features are sent to an external language model.
Fenster AI
The software runs in the browser, with nothing to install. The production module and beta features are available on request; beta features may change. As of October 2026.
05 // TESTING
We will publish results and report numbers once we receive them. Each result will apply to the tested configuration: variant and size.
Today the testing is in progress. We do not declare performance characteristics such as strength or sound insulation until we have the report in hand — we would rather say “not yet” than leave you exposed in front of your client.
Resistance of the leaf to repeated opening and closing. The test scope and results will be published with the report.
Behaviour of the leaf and frame under load. Results will follow once we receive the report.
Document in preparation: the system's sections, dimensions and tolerances in one place — for your documentation and quotes.
Scaled blocks of sections and details to drop into your drawings — so the detail in the documentation matches what leaves your workshop.
Steel grade and origin for each material batch (inspection certificate to EN 10204) — a document that shows what the construction is made of.
06 // PARTNERSHIP
Besides the material we offer access to Fenster AI on individually agreed terms, plus technical support. The system technical data sheet is in preparation.
If a client or architect asks us about ST30 doors in your area, we can pass on your contact details. The rules are agreed when we start working together; we do not promise a number of orders.
You generate technical drawings with sections, the cutting list and the glass schedule in Fenster AI. The system technical data sheet is in preparation.
Questions about a non-standard detail, hardware selection or an approval drawing come straight to us, and you get an answer based on your own order.
Run a workshop making steel doors? Get in touch. We'll reply with partnership terms and details of Fenster AI access — no obligation.
ASK ABOUT PARTNERSHIP TERMS ↗07 // CONTACT
A drawing, a photo of a sketch or a few details: size, divisions, variant and units per month. We'll reply by e-mail with a material quote and the next steps.
ENQUIRY // FORM
* Indicative total labour time (the sum of everyone's working hours) to make one single-leaf ST Modern door of approx. 900 × 2100 mm, with leaf and frame, without glazing bars — from cutting the profiles to a glazed door with hardware fitted, ready for installation. It does not include design and quoting, painting and drying, packing, transport or installation on site. It is working time, not order lead time. The time in your workshop depends on equipment (including the welding method), team experience, and the size and divisions of the leaf. The value is not a commitment or a guarantee.
The Rw estimate in Fenster AI (Acoustics module, beta) is an indicative calculation for a specific configuration of glass, threshold and opening type. It is not a test result to EN ISO 10140 nor a declared characteristic of the product, and it does not describe sound insulation in a building, which depends on installation and the surrounding wall.
Images labelled VISUALISATION show what the system can do, not completed projects. We will replace them with photographs as soon as they exist.