Model 521

• Electric operator or chain hoist
• Bottom sensing edge
• 3" track
• Bracket mounting (not available on full vertical door tracks)
• Exhaust ports
• Polyurethane insulation available in the rails and stiles
• R-value up to 4.1 depending on glazing choice
• Higher-cycle springs in 25k, 50k, 75k, 100k cycle
• Four-section pass door
• Finish options:
• Bronze anodized
• Select from 197 standard powder coat colors or colored to match specification

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Window 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) and 3/8" (10 mm) multi-wall polycarbonate
• 1⁄4" (6 mm) wire glass
• 1⁄2" (12 mm) insulated glass

STANDARD MAX WIDTH:

26'2" (7976 mm)

STANDARD MAX HEIGHT:

20'1" (6121 mm)

SECTION THICKNESS:

1 3/4" (45 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

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