DORMA RTS85 Transom Concealed Door Closer | EN 4

dormakaba RTS85 Transom Door Closer: Reliable, Concealed Door Control

The dormakaba RTS85 transom closer is a concealed, high performance door control solution, ideal for environments where aesthetics and functionality go hand in hand. An ideal solution for commercial applications the RTS85 can be installed on internal or external doors. Its fixed power size EN 4 makes it suitable for doors up to 1100mm in width and 110kg in weight, providing reliable door control.

With a variety of models, including options for a 90° or 105° hold open, this door closer offers flexibility in meeting a wide range of door control needs. When floor springs or overhead closers aren’t suitable, transom closers become the go to choice for achieving a clean, sophisticated look.

The RTS85 dormakaba transom closer is adaptable to different door types and materials, including aluminium and timber doors, with installation and setting adjustments possible before the doorset is fixed on site. A wide range of accessories and variants are available, including alternative fixed power sizes like EN 3 or EN 5, various spindle options, and configurations for glass doors. Contact our technical team to discuss the specific requirements of your door.

Key Product features:

• Choose from 4 models:

          Non-hold open
          90° hold open
          105° hold open
          Blind closer

• Mechanism only*
• Non handed
• Fixed power size EN 4
• Single or double action doors
• Suitable for doors up to 1100mm wide and 110kg
• Internal or external doors
• Complete with variable closing speed, latching action, and backcheck
• Ideal for shopfitting 
• Tested to BS EN 1154
• Certified to ISO 9001

*Floor pivot sets, arms, and plates are available separately. See the “dormakaba RTS85 Floor Pivot Sets and Accessories” section for further information.

The Four Types of the RTS85 Transom Door Closer

The dormakaba RTS 85 door closer offers four models which we explore below:

• Non-Hold Open: Designed to close automatically after every opening, ensuring consistent door security.
• 90° Hold Open: Holds the door open at a fixed 90° angle, useful in commercial spaces where constant accessibility is necessary.
• 105° Hold Open: Similar to the 90° version but offers a wider hold angle for increased accessibility.
• Blind Closer: A concealed dummy closer ideal for automatic doors, providing no resistance to the automatic function while maintaining aesthetic consistency.

Use the drop down menu above to make your selection.

dormakaba RTS85 Adjustments and Installation

The dormakaba RTS85 door closer is designed for efficient installation and adjustment. Most preparatory work can be completed by the fabricator, leaving minimal on site tasks. Unlike floor springs, no floor preparation is needed, simplifying the setup further. This dormakaba transom door closer features an adjustable closing speed and final latch action, both controlled via valve, giving users the ability to fine tune it to meet the needs of specific environments.

The dormakaba RTS85 installation instructions are available as PDF downloads from the product documents section.

dormakaba RTS85 Floor Pivot Sets and Accessories

As a mechanism only unit, the dormakaba RTS85 closer requires a separate purchase of pivots, arms, and cover plates to complete installation. We stock a variety of these essential accessories, with additional options available as special orders. Choose between side load and end load installation setups, depending on the door’s position and needs. 

• Side Load Arm and Pivot: ideal for doors installed in a closed position.
• End Load Arm and Pivot: suited for fitting the door in an open position.
• Timber Cover Plate

To discuss accessory compatibility or order any specific components, please contact us.