Dorex 784AL Door Closer #4 Power Aluminum Doors w/Backcheck
784ALThe DOREX 700 Series fixed power door closer is recommended by door hardware specialists for use on a wide variety of residential and commercial applications with moderate traffic.
Product Overview
The Dorex 784AL Door Closer (Size 4 Power) is a heavy-duty commercial door closer engineered for high-traffic interior and exterior doors. This model includes integrated backcheck, providing added protection against forceful door openings caused by wind or heavy usage.
The Aluminum (AL) finish offers a clean, neutral appearance suitable for most commercial and institutional environments.
Key Features
- Size 4 Spring Power – Designed for heavy and wide commercial doors
- Built-In Backcheck – Cushions the door during the opening cycle to prevent damage
- Aluminum Finish (AL) – Standard commercial silver finish
- Rack and Pinion Operation – Smooth, reliable door control
- Adjustable Sweep & Latch Speed – Independent speed control valves
- Surface Mounted Installation – Compatible with wood, hollow metal, and aluminum doors
- Non-Handed Design – Suitable for left- or right-hand installations
What Backcheck Does
Backcheck slows the door during opening to:
- Reduce stress on hinges and frames
- Prevent damage from strong wind gusts
- Protect walls and adjacent hardware
- Extend the life of the door and closer system
Backcheck is strongly recommended for exterior doors and high-use entrances.
Recommended Applications
- Exterior commercial entrance doors
- High-traffic interior corridors
- Retail storefront doors
- Institutional and industrial facilities
- Doors exposed to wind pressure
Technical Specifications (Typical for Size 4 Closers with Backcheck)
- Door Width Range: Typically up to 42"–48" (depending on door weight and exposure)
- Mounting Type: Standard surface mount (regular arm)
- Material: Cast aluminum body
- Adjustments: Sweep speed, latch speed, and backcheck
- Arm Type: Standard arm included
- Finish: Aluminum
When to Choose the 784AL
Select this model when:
- The door is heavy or wide
- The opening experiences frequent use
- Wind pressure affects door control
- Additional protection from forced opening is required
The Dorex 784AL provides strong closing force with backcheck protection, making it a reliable solution for demanding commercial applications.
- For moderate traffic applications
- cULus listed
- 5 Year limited warranty
- Fixed power size 1, 2, 3, 4, or 5
- Non-handed
- Cast aluminum alloy body
- Hydraulic rack & pinion mechanism
- Non-gumming, non-freezing hydraulic fluid
- 180° maximum opening
- Adjustable sweep and latching speeds
- Tri-pack for regular, top jamb or parallel arm installations
- Adjustable cushioning backcheck models available
- Drop plates available
Product Page
Instructions
751 – Installation Instructions
752 – Installation Instructions
753 – Installation Instructions
754/755, 784/785 – Installation Instructions
Templates
751 – Regular Arm / Top Jamb
751 – Parallel Arm
752 – Regular Arm / Top Jamb
752 – Parallel Arm
753 – Regular Arm / Top Jamb
753 – Parallel Arm
754/755, 784/785 – Regular Arm / Top Jamb
754/755, 784/785 – Parallel Arm
Disclaimer
- We recommend that physical hardware be ordered and verified before starting any preparation, manufacturing or installation work.
- All product installations must be done by qualified personnel using the proper mounting hardware for the appropriate surface or material.
- We recommend that installers and manufacturers use the instructions inside the packaging provided by the manufacturer, as the manufacturer reserves the right to make technical changes, modify product or information without prior notice.
- Do not exceed the maximum weight or dimensions recommended by the manufacturer.
- All technical documents, drawings and instructions are provided as-is. Customers (primary or secondary) cannot derive any claim based on the use of these documents. No responsibility is or will be assumed.