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 Model 521 

  

large glass door looks like a wall 

The Model 521 is a sectional aluminum door appropriate for environments where maximum light infiltration and/or visual access is required. Designed to fit openings up to 26'11" (8204 mm) wide and 20'1" (6121 mm) high, the Model 521 features a wide, 2-11/16" (68 mm) center stile, 3-3/4" (95 mm) or 4-1/2" (114 mm) bottom rail, based on door size.

Section thickness

1 3/4" (45 mm)

Max. standard width

26'11" (8204 mm)

Max. standard height

20'1" (6121 mm)

Material

6063-T6 aluminum

Standard finish

204R-1 clear anodized (painted white at no charge)

Center stile width

2 11/16" (68 mm)

End stile width

3 5/16" (84 mm)

Top rail width

2 3/8" (60 mm) or 3 3/4" (95 mm)

Top intermediate rail width

2 1/8" (54 mm)

Bottom intermediate rail width

1 19/32" (40 mm)

Bottom rail width

3 3/4" (95 mm) or 4 1/2" (114 mm)

Weatherseals

Bottom, flexible PVC

Standard springs

10,000 cycle

Track

2" (51 mm)

Mounting

Angle

Operation

Manual pull rope

Hinges and fixtures

Galvanized steel

Lock

Galvanized, interior-mounted single unit

  • Glazing options:
  • - 1⁄8" (3 mm) DSB
    - 1⁄8" (3 mm)or 1⁄4" (6 mm) acrylic
    - 1⁄8" (3 mm) or 1⁄4" (6 mm) tempered
    - 1⁄8" (3 mm) or 1⁄4" (6 mm) clear polycarbonate
    - 1⁄4" (6 mm) or 3⁄8" (10 mm) multi-wall polycarbonate
    - 1⁄4" (6 mm) wire glass
    - 1⁄2" (12 mm) insulated glass

  • Electric operator or chain hoist
  • Bottom sensing edge
  • 3" track
  • Bracket mounting (not available on full vertical door tracks)
  • Higher-cycle springs in 25k, 50k, 75k, 100k cycle
  • Exhaust ports
  • Four-section pass door
  • Finish options:
    - Bronze anodized
    - Select from 197 standard powder coat colors or colored to match specification