ES 4250 Storefront Systems



ES 4520 is a thermally broken center glazed storefront system for insulated glass. This product can be assembled with screw spline or shear block construction, and is compatible with ES-21 and ES-35 doors. Frames are factory fabricated and shipped “knock down” or pre-assembled for field glazing. It is also available in non thermal option for 1/4” monolithic glass.

 System Description

  • Frame Depth: 4-1/2″
  • Sight line: 2″
  • Designed for 1” insulated glass (Thermal) or 1/4” monolithic (Non Thermal)
  • Design load: +30/-30 psf
  • Water infiltration: 10 psf
  • Maximum size:
  • U Value: 0.45 (with 1/4 SB60 – 1/2 air – 1/4 clear)


  • Inside or outside glazed
  • Pour and debridge thermal break
  • Integral Door Adaptor
  • Screw spline or shear block fabrication
  • High performance sill flashing
  • Anodized, painted or wood grain finishes available

 Download PDF Manuals


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