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Introducing STEEL STIFFENED DOORS from Fortis Doors, an innovative steel-reinforced fire door with a fiberglass insulation core. This advanced design not only provides exceptional fire resistance, but also effectively limits thermal and acoustic transmission, ensuring a safe and quiet environment.

Designed for heavy-duty to maximum-duty applications, STEEL STIFFENED DOORS accommodates a wide range of needs and environments. At Fortis Doors, we pride ourselves on delivering solutions that go beyond expectations, providing our customers with products of the highest quality and performance.

  • 1-3/4″ thick
  • Cold rolled steel face skin
  • 18-gauge face skin
  • Perimeter channel construction
  • Center seam edge design
  • Handed door design
  • 22-gauge steel-stiffened and fiberglass core
  • Maximum opening size 5′ x 12′ single
  • Maximum opening size, 10′ x 12′ pair
  • Factory applied rust inhibiting primer finish
  • Fire Rated up to 3 hours
  • STC 38 Rating
  • 0.64 U-Factor with Mercury frame
  • 1.56 R-Value with Mercury frame
  • 7-gauge hinge reinforcement
  • Custom construction with seam or seamless design rated for heavy duty to maximum duty use.
  • Standard 22-gauge vertical steel-stiffeners for added strength.
  • Fiberglass insulation for thermal and sound transmission reduction.
  • Exceeds the ANSI A250.4 performance and acceptance criteria achieving 4 million cycles, 4 times the Level A requirements
  • Cold rolled, A60 galvannealed or G90 galvanized steel face skins
  • Flush, Vision Lite, Narrow Lite, Half Glass, Full Glass or Louver door design
  • Center seam or seamless edge
  • 18, 16, 14 and 12-gauge face skins
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