Aluminum Thermally Broken Framing System

Aluminum Thermally Broken Framing from Special-Lite® (SL-450TB and SL-600TB models) is available to meet your project’s needs.

Aluminium framing system for thermally broken structures.


Extruded from 6063-T6 aluminum alloys, 2″ x 4-1/2″ SL-450TB and 2″ x 6″ SL-600TB framing have a nominal wall thickness of .125″. Corner construction employs shear block fabrication method.

Features and Benefits

  • Thermally broken construction enhances thermal performance
  • Shear block construction provides the ability to erect on the job site
  • Accommodates up to 1-1/16″ glazing, expanding design and energy savings options
  • Uniform glazing gasket for both interior and exterior simplifies ordering and installation
  • Bulb gasket weather-stripping resists wear, will not stretch or shrink
  • Anodized or painted finishes available to match your door
  • Sill options available in both 4-1/2″ and 6″ frame depth

Product Ratings and Performance