• A brick building labeled Tire Center with four closed garage doors, red posts connected by yellow chains, and a paved driveway in front.
  • A modern auto service center with large glass-paneled garage doors and a sign reading SERVICE above the entrance. The building has a white facade with black accents.
  • A view from inside a fire station garage showing red fire trucks with American flags parked outside, seen through large red-framed glass doors. The interior has tiled walls and coiled hoses on one side.
  • A vibrant, colorful graffiti mural covers an exterior brick wall with a large glass garage door, reflecting light. Air conditioning units are mounted above, and the ground is wet, suggesting recent rain.
  • A fire station with three bright red garage doors, yellow brick walls, and signage reading Clarion Fire & Hose Co No. 1 above the middle door. The pavement in front is marked with parking spaces.
  • Three modern glass and metal garage doors with black frames are set into a building with brick and dark paneling. Yellow bollards stand in front of each door, and city lights and buildings are visible in the background.
  • A colorful storefront with large windows and a sign reading “Dude’s Daiquiris” is seen beside a vivid mural. A bright pizza sign points left. A blue bench sits on the sidewalk in front.

Aluminum Glass Door - 521

Model 521

An excellent solution for applications where visual access and light transmission are key considerations.

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Overview

Aluminum Glass Door 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 26’2″ (7976 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.

A simple black and white line drawing of a bicycle, shown from the side. The illustration clearly displays the wheels, frame, handlebars, seat, pedals, and chain.

Wide array of 
stained and painted finishes

A person sits cross-legged on the floor meditating, with hands resting on their knees. A large clock is behind them, symbolizing mindfulness and taking time to meditate. The background is blank.

Wood-grain
texture

A stick figure sitting at a desk raises its arms in frustration while looking at a computer monitor, with a slanted desk lamp overhead.

Customize with windows and hardware

A person in a wheelchair is depicted ascending a flight of stairs using a stair lift, illustrating accessibility solutions for individuals with mobility impairments.

Superior thermal performance

A black cat sits on a windowsill, looking outside. Sunlight streams through the window, casting a warm glow on the cat’s fur and the surrounding area. Lush green trees can be seen outside the window.

Superior 
durability

A silhouette of a person with their head resting on their hand, appearing thoughtful or contemplative.

Wind load options
upon request

Colors

Anodized Finishes

A plain, light gray background with no visible objects, text, or patterns.

Clear (standard)

A close-up view of a flat, textured surface in a solid, muted brownish-green color. There are no distinct patterns or objects visible.

Light Bronze

Solid brown textured surface with a matte finish, showing faint lines and subtle variations in shading, resembling fabric or suede material.

Medium Bronze

Brown textured surface with a slight gradient from darker at the top to lighter at the bottom, featuring subtle horizontal lines across the image.

Dark Bronze

A plain square with rounded corners, filled with a light beige or cream color.

Almond

A solid dark gray rectangle with no visible objects, text, or patterns.

Black

Powder Coat Color Options

PowderGuard® Premium powder coat options are available in approximately 200 colors as well as custom matching to specification.

Vertical stripes in a gradient of colors, transitioning smoothly from brown, blue, and green on the left to yellow, orange, and red on the right, with the colors reflected below in a blurred effect.

Glass/Windows

Two small toy vehicles, one a red sports car and the other a red pickup truck, are positioned side by side on a light surface.

Double Strength (DSB) Standard

A blurry image of two red toy cars placed side by side on a light surface.

Obscure

A heavily blurred image with indistinct shapes and colors, primarily pinkish-red and white, making it difficult to identify any objects or subjects.

Satin Etched

Two small red toy vehicles, a sedan and a pickup truck, are placed side by side on a light gray surface.

Gray Tint

Two toy vehicles—a red sedan and a red pickup truck—are placed side by side on a light gray surface. The pickup truck is slightly angled towards the sedan.

Green Tint

Two small red toy vehicles, a car and a pickup truck, are positioned side by side on a plain surface.

Black

A blurred image with indistinct colors and shapes, making it difficult to identify any specific objects or details. The background appears to be light gray with a dark, unfocused area near the center.

Impact Frosted Polycarbonate

Enhancements

  • 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
  • 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
  • Wind load options available
  • Finish options:
    • Bronze anodized
    • Select from 197 standard powder coat colors or colored to match specification
  • 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

Brochures

Commercial Aluminum Doors Brochure

Download PDF

Polycarbonate Glazing Brochure

Download PDF

Dimension - Sectional Track

Download PDF

Dimension Chart - Sectional Framing Pads

Download PDF

Documents

Explore the full specifications of our products. Our technical data sheets provide comprehensive information on dimensions, assembly methods, and construction requirements. Make well-informed decisions by planning your investment down to the last detail.

BIM

Aluminum Glass Door Model 521 - BIM Model

Download BIM

Shop Drawing

Aluminum Full View Sectional Door Model 521 CAD (PDF)

Download DWG

Aluminum Full View Sectional Door Model 521 CAD (DWG)

Download PDF

Specifications

Aluminum Sectional Doors 521 Specs

Download PDF
Download DOC

Product Literature

Commercial Aluminum Doors Brochure

Download PDF

Dimension - Sectional Track

Download PDF

Polycarbonate Glazing Brochure

Download PDF

Dimension Chart - Sectional Framing Pads

Download PDF

Product Literature

Commercial Aluminum Door Model 521 Warranty

Download PDF

Warranty

1 Year

Gallery

Construction

Product Specifications

Standard Max Width26’2″ (7976 mm)
Standard Max Height20’1″ (6121 mm)
Section thickness1 3/4″ (45 mm)
Material6063-T6 aluminum
Standard finish204R-1 clear anodized(painted white at no charge)
Center stile width2 11/16″ (68 mm)
End stile width3 5/16″ (84 mm)
Top rail width2 3/8″ (60 mm) or 3 3/4″ (95 mm)
Top intermediate rail width2 1/8″ (54 mm)
Bottom intermediate rail width1 19/32″ (40 mm)
Bottom rail width3 3/4″ (95 mm) or 4 1/2″ (114 mm)
WeathersealsBottom, flexible PVC
Standard springs10,000 cycle
Track2″ (51 mm)
MountingAngle
OperationManual pull rope
Hinges and fixturesGalvanized steel
LockGalvanized, interior-mounted single unit

*U-factor values are independently tested and verified per ANSI/DASMA 105.
**Overhead Door™ Brand uses a calculated door section R-value for our insulated doors.

Get inspired

Explore our photo galleries to get inspired for your new residential or commercial door.

SEE GALLERY
View through large windows of a fire station showing several red fire trucks parked in a well-lit garage, with equipment and tools visible in the background.
A modern building with large glass garage doors labeled SERVICE above the entrance, likely a service center or auto repair shop, with a paved sidewalk in front.
Interior of an industrial facility with metal tracks running down the center, surrounded by machinery, tools, and workbenches. A large yellow crane is mounted overhead, and the space is brightly lit with high ceilings.
A suburban house with a decorative double garage door, surrounded by landscaped bushes, colorful flowers, and trimmed shrubs. The driveway is paved, and the house features tan siding with brick accents.
A modern house exterior with stone walls, a wooden garage door featuring rectangular windows, a balcony with a metal railing, and stairs on either side leading to the entrance.
Modern house with stone and wood siding, large windows, two gray garage doors, and a spacious driveway under a partly cloudy sky.
Modern white two-story house with black-framed windows, wooden accents, and a metal roof. There is a three-car garage with glass doors and a landscaped front yard with small trees and bushes under a clear blue sky.
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