Model 300

Description
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Description

Model 300 – Heavy-Duty Service Door

Engineered Strength for High-Cycle Industrial Demands

The ADT Model 300 Rolling Service Door is built to perform in the toughest industrial environments. Designed for high-cycle use, this heavy-duty door combines rugged construction with smooth operation to deliver long-term reliability and security. Featuring interlocking 20-gauge galvanized steel slats and reinforced cast iron end locks, the Model 300 stands up to frequent use, harsh weather, and demanding conditions.

Whether you need secure access for a distribution center, warehouse, or high-traffic service bay, the Model 300 offers dependable performance with customizable options to meet your facility’s exact needs.

Applications

Distribution centers
Warehouses
Commercial buildings
Parking structures
High-use service bays

Operation Options

Manual lift
Chain hoist with gear reduction
Internal or external industrial motors
Hand crank with removable handle

Technical Specifications

Curtain:Interlocking slats, 20-gauge galvanized steel (ASTM A653); optional polyester enamel aluminum or stainless steel finishes
Curtain Profiles: Curved (SC3) or flat (SF3)
Bottom Bar: Double steel angle (min. ⅛”) with rubber astragal for weather-tight seal
Guides: Structural steel angles (min. 3″ wide, 3/16″ thick) with removable stops; optional windlock bars
Counterbalance: Heavy-duty helical torsion spring system, grease-packed, sealed ball bearings, external tension adjustment
End Brackets: Factory-painted steel (min. 3/16″ thick) housing shaft and bearings
Hood: 24-gauge galvanized steel with baked enamel coating; intermediate supports to prevent sagging
Finish: Factory-applied rust-inhibiting enamel; optional powder coat or stainless steel
Locking: Slidebolts with padlock provisions (manual/chain models); self-locking gears (motorized)

Features & Benefits

Built for high-cycle, industrial-grade performance
Windload stanard resistance up to 20 psf; optional windlocks for enhanced protection
Weather-resistant bottom seal and tight slat alignment
Smooth, quiet operation with sealed bearings and precision-balanced springs
Multiple operation methods for flexible facility integration
Customizable with vision panels, insulation, and finish options

Optional Features