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 in a white finish. 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 also offered in 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.


Standard max width

28’2″ (8585 mm)

Standard max height

24’1″ (7341 mm)


1 year limited

Nominal thickness

2″ (51 mm)


Expanded polystyrene


7.35 (1.29 W/Msq)

Exterior steel

24-gauge galvanized steel

Exterior surface


End stiles

16-gauge steel

Center stiles

16-gauge steel

Interior color


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


Manual pull rope


White or Industrial Brown baked-on polyester


Interior mounted slide lock

Door Options

Door Options

  • Electric operator or chain hoist
  • 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


Exterior Color

  • White

  • Industrial Brown

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


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