Sectional Steel Door Model 426 Model 426

Sectional Steel Door Model 426 Model 426

Sectional steel door model 426 is ideal for heavy-duty applications requiring protection against the elements. These doors feature a 2" (51 mm) panel thickness, 16-gauge steel intermediate and end stiles, ribbed steel exterior and 26-gauge steel back cover. Polystyrene insulation provides an R-value of 7.35. The Model 426 is a 24-gauge door available in sizes up to 28´2" (8585 mm) in width and 24´1" (7341 mm) in height and is offered in white or industrial brown. A multitude of options including reinforcing struts, movable center posts, and motor operation allow these insulated heavy-duty doors to be used in a variety of commercial and industrial environments.


Product Specifications  
Standard Max Width 28'2" (8585 mm)
Standard Max Height 24'1" (7341 mm)
Nominal thickness 2" (51 mm)
Insulation Expanded polystyrene
R-value 7.35 (1.29 W/Msq)
Exterior steel 24-gauge galvanized steel
Exterior surface Ribbed
End stiles 16-gauge steel
Center stiles 16-gauge steel
Interior color White
Back cover 26-gauge galvanized steel (poly-bonded laminate, high impact polystyrene (HIPS) backed optional)
Standard mounting Angle mount
Standard track 2" (51 mm)
Standard springs 10,000 cycle
Weather Stripping Standard on bottom
Operation Manual pull rope or electric operator
Finish White or Industrial Brown baked-on polyester
Lock Interior mounted slide lock
Wind Load FBC approved wind load options available


  • 1-year limited

  • white color swatch


  • industrial brown color swatch

    Industrial Brown

Actual door color may vary slightly from the digital representation above.

  • Chain Hoist or Electric Operator is recommended for doors above 10’ tall or more than 400 pounds
  • Bottom sensing edge
  • Full sash section with 1/8" (3 mm) DSB, insulated; 1/8" (3 mm) and 1/4" (6 mm) acrylic
  • Individual lites with 1/2" (13 mm) DSB
  • 3" (76 mm) track
  • Bracket mounting (not available on full vertical door tracks)
  • Higher-cycle springs in 25k, 50k, 75k, 100k cycles
  • Exhaust ports
  • Jamb weather seals
  • Bottom strips; including: looped PVC weatherstrips, flexible PVC astragal weatherstrips, and double-contact weatherstrips
  • Reinforcing struts of roll-formed, galvanized steel
  • Movable center posts for 2" (51 mm) or 3" (76 mm) tracks that roll away, with automatic safety catches that prevent door closure when posts are removed
  • Tumbler keyed lock
  • Window Glazing Options 
  • Warehouse Package – Quick install system available
  • Impact Section Available
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