Trifab 451UT Framing System

Storefront Framing

Trifab® 451UT Framing System

The Trifab® 451UT Framing System is engineered for the most demanding thermal performance by employing a “dual” thermal break. A perfect choice for single-span storefront, ribbon window or punched openings, this screw spline fabricated system has center set glass and a pre-glazed option. The Trifab® 451UT Framing System offers a pre-glaze option for the existing center set screw spline assembly application, available on non-thermal, thermal and ultra-thermal frame types. Pre-glaze units can be completely fabricated and glazed in the shop, minimizing job-site costs and enhancing field-installed quality.

  • 2″ (50.8mm) sightline
  • 4-1/2″ (114.3mm) depth
  • Ultra-thermal performance
  • Blast mitigation
  • Center plane glass applications
  • Pre-glazed option (screw spline)
  • Trifab® 451UT framing system is 4-1/2″ deep with a 2″ sightline
  • Center plane glass application
  • Flush glazed from either the inside or outside
  • Screw Spline fabrication
  • Screw Spline pre-glazed option
  • Dual Isolock® lanced and debridged thermal break
  • Infill options up to 1-1/8″ thickness
  • Anodized finishes in four choices
  • Painted finishes in standard and custom choices

Optional Features

  • High performance flashing
  • Acoustical rating per AAMA 1801 and ASTM E 1425
  • Project specific U-factors (see thermal charts in Architectural Detail Manual)
  • Pre-glaze Option Features*
    • Tested solution with installation instructions enables shop fabrication and reduces field labor
    • Vertical mullions with 1/4″ reveal provide uniform aesthetics
    • High-performance sill flashing and clip design reduces installation time
  • Composite end jamb allows for ease of installation of the last bay
  • Trifab® 451/451T/451UT Framing Systems provide the right thermal performance for your project
  • View our pre-glaze option flyer here

*For Trifab® 451/451T/451UT Framing System center set screw spline assembly applications only.

Product Applications

  • Storefront, Ribbon Window or Punched Openings
  • Single span
  • Integrated entrance framing allowing Kawneer standard entrances or other specialty entrances to be incorporated
  • Kawneer standard or GLASSvent® windows are easily incorporated

Thermal Technology

Find out more here.

Blast Resistant

Find out more here.

Related Product Approvals

Find out more here.

Trifab® 451UT Framing System - Architectural Detail Manual
4 MB
Trifab® 451UT Framing System - Flyer
2 MB
Storefront Framing Product Selection Guide
571 KB
Trifab® VersaGlaze® 451 Framing Systems Pre-Glaze Option Flyer
316 KB
Trifab® 451UT Framing System - Product Green Guide
244 KB
Trifab® Framing Systems and Storefront Framing Systems - EPD
1 MB
Trifab® 451UT and 601UT Framing Systems - DECLARE Label
880 KB
Trifab® 451UT and 601UT Framing Systems - MTS
291 KB
Finishes Brochure
5 MB
Finishes Information - Architectural Detail Manual
238 KB
Anodize Finishes - Color Chart
82 KB
Liquid Paint - Color Chart - Permadize®
1 MB
Liquid Paint - Color Chart - Permafluor™
350 KB
Powder Paint - Color Charts - Permacoat™
127 KB
Trifab® 451UT Framing System - English
Trifab® 451UT Framing System - French
Trifab® 451UT Framing System - Spanish US

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Typical Framing Details (Outside Glazed)
Optional Framing Details (Outside Glazed) -"Glass Stops Up"
Typical Framing Details (Inside Glazed)
Pre-Glazed Option Details - (Outside Glazed)
Pre-Glazed Option Details - (Outside Glazed) - "Glass Stops Up"
Pre-Glazed Option Details - (Inside Glazed)
Pre-Glazed Optional Vertical Details
Typical Corner Details
Head and Jamb Compensating Details
GLASSvent® UT Windows Details (Outside Glazed)
GLASSvent® UT Windows Details (Outside Glazed) -"Glass Stops Up"
GLASSvent® UT Windows Details (Inside Glazed)
8225TL Windows Details (Outside Glazed)
8225TL Windows Details (Outside Glazed) -"Glass Stops Up"
8225TL Windows Details (Inside Glazed)
Stool Trims, Brake Metal Adaptors and Splice Sleeves
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Trifab™ 451UT Framing System
Trifab™ 451UT Framing System

While most of our products are not hazardous in and amongst themselves, hazardous properties can develop when the product is altered through cutting, welding, and grinding.  Details on the specific hazards that can develop and the proper protective measures to use can be found in the SDSs.

Arconic’s SDS database provides PDF files of safety information on specific materials.  The SDS ID numbers (product code) and description for materials used in Kawneer products are listed below.

1405 – Kawneer Thermal Break Filled Extrusions
1385 – Kawneer Acrylic Paints
1386 – Kawneer Fluoropolymer Paints

1526 – Kawneer Bloomsburg Solvent Recovery Still Residuals

1387 – Painted Architectural Aluminum Extrusions
509 – Aluminum Extrusions, Anodized Aluminum Products


Search Arconic’s SDS database for safety information on specific materials.


Warranty Disclaimer TBC

Project Warranty Cover Sheet (English)
137 KB
Project Warranty Cover Sheet (French-Canadian)
137 KB
Project Warranty Cover Sheet Sample (English)
139 KB
Project Warranty Cover Sheet Sample (French-Canadian)
140 KB
Material & Workmanship - English
185 KB
Material & Workmanship - French
190 KB
Material & Workmanship Sample (English)
203 KB
Material & Workmanship Sample (French Canadian)
212 KB
Anodized Finishes Warranty - English
523 KB
Anodized Finishes Warranty - French
517 KB
Anodized Finishes Sample (English)
529 KB
Anodized Finishes Sample (French Canadian)
524 KB
Painted Finishes Warranty - English
557 KB
Painted Finishes Warranty - French
538 KB
Painted Finishes Sample (English)
565 KB
Painted Finishes Sample (French Canadian)
550 KB
Insulating Glass Warranty - English
498 KB
Insulating Glass Warranty - French
499 KB
Insulating Glass Sample (English)
502 KB
Insulating Glass Sample (French Canadian)
504 KB
Laminated Glass Warranty - English
122 KB
Laminated Glass Warranty - French
123 KB
Laminated Glass Sample (English)
126 KB
Laminated Glass Sample (French Canadian)
128 KB
Corrective Field Repairs (English)
154 KB
Corrective Field Repairs (French-Canadian)
152 KB