dormakaba GROOM GR-3500 Door Closer EN 3-5 Sliding Rail Silver Asymmetric Gear

Product Overview

The dormakaba GROOM GR-3500 (version B) is a surface-mounted door closer equipped with a sliding rail, featuring continuously adjustable closing force in the EN 3-5 range. It accommodates door leaves up to 1250 mm wide and is approved for use on fire-rated and smoke-control doors. Installers can mount this closer on the hinge side (door leaf) or opposite the hinge (frame), increasing flexibility across different door configurations.

A key differentiator for the GR-3500 is its asymmetric gear mechanism, which significantly reduces opening resistance?an advantage for commercial or institutional projects requiring user-friendly passage. This feature helps satisfy accessibility requirements while reducing long-term wear on components. Version B's mounting flexibility and user-oriented operation make it well-suited for facility fitouts in offices, schools, and healthcare buildings where both regulatory compliance and occupant comfort are priorities.

Key Features

• Adjustable closing force EN 3-5 ? supports door widths up to 1250 mm, covering medium to heavy doors


• 180° opening angle (hinge side) ? allows use in high-traffic or wide-opening scenarios


• Fire-rated and smoke-control approval ? compliant for use on safety-critical doors


• Asymmetric gear transmission ? lowers opening resistance to aid accessibility and reduce user effort


• Closing speed and latch control ? independent adjustment for smooth and secure door operation


• Anti-wind (back-check) function ? adjustable cushioning protects against damage from forceful opening


• Thermo valve technology ? stable operation across temperature fluctuations for all-season use

Technical Specifications

• Closing Force: EN 3-5 (continuously adjustable)


• Maximum Door Width: 1250 mm


• Maximum Opening Angle: 180° (hinge side)


• Closing Speed Regulation: 180°?7°


• Final Latching Action (Dobicia): 7°?0°


• Back-Check (Antiwind) Range: 70°?180°


• Application: Fire-rated and smoke-control doors approved


• Gear Type: Asymmetric


• Mounting: Hinge side (door leaf) or opposite (frame)


• Valve Access: Frontal


• Color: Silver

Applications

Used for single or double-leaf doors in commercial, institutional, and public buildings such as offices, schools, and hospitals. Compliant for installation on fire-rated and smoke-control door assemblies. Supports accessible and barrier-free projects where low opening resistance is needed, and works for both hinge side and opposite side mounting scenarios.

Packaging & Shipping

Standard export packaging. Unit includes door closer body, sliding rail, mounting hardware, and installation instructions.