Origin of the FMS Profile

The exclusive steel profiles used by Fenestration Metal Smiths in their products have a heritage spanning over 100 years.

The story begins with Sir Henry Bessemer, who in 1856 pioneered a production process for hot-rolled steel, laying the foundation for the manufacture of integrated steel windows and doors.

After World War I, steel windows and doors using the original specialized profiles became prolific in all forms of architecture, both commercial and residential. The minimalist aesthetics of these profiles were in keeping with new fashions, especially the “International Style”, and the demand for light, airy and well-ventilated buildings.

With the advent of these exclusive profiles, manufacturers for the first time were able to make composite windows of almost any size – yet retain such slender lines as to make facades virtually transparent.

The universal profiles in turn gave birth to the “W20” range in 1964 and the “MW40” range in 1992. These modern profiles, and the newly released “MT50” thermal range, are the pedigreed descendants of the original specialized profiles, which FMS uses exclusively for manufacturing its classic steel windows and doors.


FMS steel profiles, specifically engineered for window and doors, are hot rolled in limited lots from 100% recycled steel. The profiles are shipped from Switzerland to our facility in container loads of 20-foot sections from which windows and doors are cut, shaped, welded and finished. With dedicated craftsmanship, each window and door is individually fabricated following explicit, client-approved CAD drawings.


FMS’s standard powder coat finish is a two-coat process that meets or exceeds AAMA 2604-05.


  • Sand blast
  • Phosphate wash, rinse and dry
  • First coat (Gray): Drylac 69/90500 Zinc Rich, oven cured
  • Second coat (Color): Drylac Series 38, oven cured


FMS delivers and installs its products anywhere in Texas and adjoining states. At FMS, the folks who fabricate are the folks who install. We meet construction schedules and guarantee proper function and aesthetics.


FMS residential products include a Ten-Year Transferable Warranty.

FMS commercial products include a Three-Year Commercial Warranty.


Our engineered glazing system is a major contribution to the lasting value of FMS windows and doors. We have worked closely with glazing professionals to design a system that provides quality, cost-effectiveness and ease of installation – and meets or exceeds the proven industry standard for weather seal, security, and ease of future replacement of glass.


Many municipalities have energy codes that require U-factor and SHGC ratings for fenestration. These ratings are based on the entire component, not just the glass, and can only be obtained through testing by a National Fenestration Rating Council (NFRC) approved laboratory.

FMS windows have been tested and are NFRC Certified. Our windows can meet the most strin-gent energy municipal codes; including California’s Title 24. Ratings for Fenestration Metal Smiths, Inc. windows can be found in the Certified Product Directory of the National Fenestration Rating Council website (nfrc.org). Documentation is available upon request.


FMS windows have been tested for Design Pressure, Air Infiltration and Water Penetration by an independent laboratory per AAMA/WDMA/CSA Specifications. Documentation available upon request.


  • Steel windows and doors have a low carbon footprint from raw material acquisition to decommissioning.
  • FMS profiles are 100% recycled steel (aluminum is typically 31% recycled).
  • Steel is three times stronger than aluminum thus allowing for slimmer sections and using less material.
  • The median life cycle of steel windows is 50 years, aluminum windows 40 years.
  • FMS relies on solar/wind renewable energy sources in its manufacturing operations.
  • FMS recycles all metal waste created during fabrication.
  • FMS is committed to environmentally responsible finishing systems.