thermally broken window frames

Thermally Broken Fixed Window
Style: TB 1000

Live large and bring natural illumination into your space with Portella fixed windows. Allow the outdoor light to stretch into any space from a dull stairway to a dark hallway. Or transform a large wall into a breathtaking vista. Choose from a variety of geometric shapes, sizes and colors that are beautiful, airtight and energy efficient. Use them in combination with other Portella windows and doors to create a custom configuration.

Diagram of Portella Thermally Broken Fixed Window

Thermally Broken Fixed Window

Style: TB 1000
  • NFRC rated Thermally Broken
  • Carbon Steel (Stainless Steel, CorTen, and Bronze available)
  • Precision cold formed profiles with “stepped leg” design
  • High density cast in polyurethane thermal barrier
  • Double glazed (single and triple available)
  • Glass: Cardinal 366/Argon/Clear tempered (other glass options available)
  • Spacer: Dark Bronze
  • Glass Thickness 1 1/8” overall
  • Glazing Orientation: Exterior Wet Glazed (metal stop option)
  • True divided lite construction with 1 3/8” muntin bars
  • Available in standard and custom paint options: grey, pewter, gun metal, chestnut brown, dark bronze and black
  • Continuous steel mounting flanges with orientation options
  • No size limitations
Fixed Window
Fixed Window to Floor
Fixed Window w Tall Bottom Rail
Thermally Broken Fixed Window


  • Pewter
  • Gun Metal
  • Grey
  • Brown
  • Dark Bronze
  • Black
*Patina finishes available upon request.


There are no hardware options available for this product.

Modern house with windows by Portella.

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Modern house with windows by Portella.

How to Order

All Portella products are custom made to your exact specifications. Contact us today to be connected to your personal Project Manager. We’ll need overall sizes and details of what you’re looking for and your location to determine which product will work best in your climate and meet your state’s regulations. Click here for details.

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