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

Product Overview

The dormakaba GROOM GR-3500, version G, is an overhead door closer with a sliding rail system suitable for mounting on the hinge side of the frame or the opposite side on the door leaf. Designed for use on doors up to 1250 mm wide, it supports opening angles up to 180° on the hinge side and is approved for installation on both fire-rated and smoke-control doors. Adjustment valves are conveniently accessible from the front for simplified onsite tuning.

This model's distinctive feature is its asymmetric gear mechanism, significantly reducing opening resistance and making passage easier for all users. This minimizes compliance risk on projects with accessibility requirements and reduces physical effort for high-traffic commercial spaces. Especially appropriate for bulk procurement in office, public building, and multi-residential construction where ease of use and certified fire/smoke safety are mandatory.

Key Features

• Adjustable closing force EN 3-5 ? covers a broad range of internal and external doors up to 1250 mm wide


• Sliding rail design ? aesthetic finish with concealed fixings for architectural installations


• Asymmetric gear mechanism ? lowers door opening force for improved user comfort and barrier-free access


• Thermal valve technology ? stable hydraulic performance across seasonal temperature fluctuations


• Back-check function (wind dampening) ? protects door and walls by regulating opening speed between 70°-180°


• Closing speed and latching force adjustment ? fine-tuning possible from 180°-0°, accessible from the face of the closer


• Certified for fire and smoke doors ? suitable for applications requiring EN fire safety compliance

Technical Specifications

• Closing Force: EN 3-5 (adjustable)


• Maximum Door Width: 1250 mm


• Maximum Opening Angle: 180° (hinge side)


• Mounting: Hinge side of frame or opposite side of door leaf


• Closing Speed Adjustment Range: 180°?7°


• Latching Action Adjustment Range: 7°?0°


• Back-Check Range: 70°?180°


• Gear Type: Asymmetric rack and pinion


• Thermovalve Technology: Yes


• Finish: Silver


• Application: Fire and smoke control doors

Applications

Used in commercial, public, and multi-residential buildings for single and double leaf doors where both aesthetics and certified safety are required. Compatible with fire-rated and smoke-control door assemblies. Suited for new construction, renovations, and bulk specification projects demanding barrier-free access and adjustability for variable door conditions.

Packaging & Shipping

Standard export packaging. Unit includes door closer body, sliding rail, mounting hardware, and installation instructions. Protective box suitable for single or bulk shipments.