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GT1500 Fixed

Fixed Window

Frame Depth (inches) 4.5

Description This thermal strutted architectural grade fixed window system mulls to fixed and operable products of the same frame depth.


  • Applications
  • Commercial
  • Energy Performance
  • Healthcare
  • Residential High-Rise

AAMA Rating


Test Size (inches)

60 x 99

Air Infiltration (cfm/ft2)


Water Resistance (psf)


Design Pressure Positive (psf)


Uniform Load Structural (psf)



0.28 - 0.33




The air infiltration and water resistance performance values provided above were achieved in a controlled lab environment. Performance of our products in the field will vary depending on product configurations, installation methods, and ambient conditions. AAMA 502 “Voluntary Specification for Field Testing of Newly Installed Fenestration Products” should be adhered to for testing installed products.

Standard Features

  • Dual strut thermal breaks with 34 mm separation for improved thermal performance
  • Mulls to 4.5" frame fixed and operable products
  • Exterior-beveled (putty) glazing leg & up to 1" insulating glass

Optional Features

  • Exterior-applied muntin grids
  • Radius shapes and custom curving to specification
  • Dual finish (two-tone color)

Related Products

Frame Depth (inches) 4.5
Description A double hung with side-load sash commercial window for monumental sizes. Block and tackle heavy-duty balances up to 120 lbs. per sash.
U-Value0.38 - 0.40
AAMA RatingAW-PG60
Test Size (inches)60 x 99
Air Infiltration (cfm/ft2)0.27
Water Resistance (psf)12
Design Pressure Positive (psf)60.15

Technical Data

Product Literature

Additional Resources

Installation Accessories

4½" Unitized Frame Accessories
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4½” Frame Accessories
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CAD Files




Fixed; Historic
TESTING: Our products are tested to the standards of and certified by the American Architectural Manufacturer's Association and the National Fenestration Rating Council.