Dorex 785DU Door Closer #5 Power Duranodic Doors w/Backcheck

Product Overview

The Dorex 785DU Door Closer (Size 5 Power) is an extra heavy-duty commercial door closer designed for wide, heavy, and high-traffic doors. Engineered for demanding exterior and institutional applications, this model includes integrated backcheck to protect the door and frame from damage caused by forceful opening or wind pressure.

The DU (Duranodic) finish provides a dark bronze appearance commonly specified for aluminum storefront and architectural entrance systems.

Key Features

• Size 5 Spring Power – Maximum closing force for wide and heavy commercial doors
• Integrated Backcheck – Cushions the door during opening to prevent structural damage
• Duranodic (DU) Finish – Dark bronze finish ideal for storefront applications
• Heavy-Duty Rack and Pinion Mechanism – Smooth and controlled operation
• Adjustable Sweep & Latch Speed – Independent valve adjustments
• Surface Mounted Design – Compatible with wood, hollow metal, and aluminum doors
• Non-Handed Installation – Suitable for left- or right-hand doors

What Size 5 Power Is Used For

Size 5 closers are typically specified for:

• Extra-wide exterior doors
• Industrial or institutional facilities
• High-wind exposure environments
• Very high traffic openings
• Doors requiring maximum consistent latching force

Technical Specifications (Typical for Size 5 Closers with Backcheck)

• Door Width Range: Typically up to 48" and larger (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: Duranodic (Dark Bronze)

Benefits of Backcheck on Size 5 Closers

Backcheck is critical in heavy-duty applications because it:

• Reduces hinge and frame stress
• Prevents wall and hardware damage
• Minimizes door slamming in windy conditions
• Extends the lifespan of the entire door system

When to Choose the 785DU

Select the 785DU when:

• The door is heavy, wide, or oversized
• The opening is exposed to strong wind
• Traffic is very high
• Maximum closing control and durability are required

The Dorex 785DU is built for demanding commercial environments where reliability, strength, and protection are essential.