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DMA-RTS85-NHO-MECH
Dorma RTS85 Non Hold Open Transom Door Closer
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Dorma RTS85 Non Hold Open Transom Door Closer
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Delivery Information
| Delivery Time Frame | Delivery Information |
| Next Working Day By 1PM | When an order is placed by 3pm for next working day on certain items |
| Standard Delivery | Usually delivered in 2 to 4 working days |
| Delivery Charges | |
| UK Mainland | Prices start at £3.95 for very small items, £6.50 for small, £9.50 for medium and £20 for large/long items |
| Scottish Highlands & Islands, Northern Ireland & Ireland | Prices from £30, please see our delivery page for more info. |
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£195.79
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£163.16
Excl. VAT
Incl. VAT
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Description
Dorma RTS85 Non Hold Open Transom Door Closer
Finding the perfect balance between high-performance door control and minimalist design is a common challenge for architects and commercial property managers. The Dorma RTS85 Non Hold Open Transom Door Closer addresses this necessity by offering a robust mechanical solution that remains entirely concealed within the transom of the door frame. By moving the mechanism away from the floor or the face of the door, this unit preserves the sleek look of modern aluminium or glass shopfronts while ensuring consistent closure performance.
This model is specifically engineered for environments where aesthetics are just as important as structural integrity. Because the device is hidden from view, it eliminates the visual clutter associated with traditional surface-mounted closers, allowing the architectural features of the entrance to take centre stage. It is the premier choice for professionals who refuse to compromise on either style or safety.
Mechanical Physics and Operational Force
At the heart of this transom hardware lies a sophisticated system of springs and fluid-filled valves designed to manage the kinetic energy generated by swinging a door. When you open a door, you are storing potential energy within the internal spring mechanism of the unit. The internal valve system acts as a hydraulic dampener, carefully regulating the release of this energy to ensure the door closes in a controlled and predictable manner.
- The internal spring is calibrated to handle high-traffic environments, providing a consistent closing force that resists external wind pressures or building air pressure imbalances.
- The two independent valves allow for precise customisation of the closing speed and the latching action, which prevents the door from slamming while ensuring the lock engages fully.
- The integrated backcheck feature provides a vital cushion effect, preventing the door from hitting the frame or adjacent walls if it is pushed open too quickly by a user or a gust of wind.
By utilising this specialised equipment, you are installing a system that manages torque and load distribution across the top rail of the door. This design protects the hinges and frame from premature wear by ensuring the door does not jerk or overextend during its arc of travel. The materials used inside the housing are selected to withstand thousands of cycles, maintaining consistent tension even under extreme commercial usage.
Step by Step Interaction and Daily Workflow
Operating a door equipped with this mechanism is an intuitive experience for the end user. When a person approaches the entrance, they apply manual force to the handle or push plate to initiate movement. The internal mechanism offers smooth resistance, which provides a premium feel that signals quality to the person entering the building.
- Upon releasing the handle, the user can walk through the entrance with complete confidence that the door will return to its closed position without further assistance.
- The door accelerates initially before reaching the latching stage, where the second valve takes over to slow the movement down for a soft, quiet final closure.
- Because this version is non-hold open, the door will automatically engage its latch every time it reaches the fully closed position, which is essential for maintaining building security throughout the day.
For the installer, the workflow is equally streamlined. The fabricator can perform the majority of the metal preparation before the door even arrives on site. This approach significantly reduces the time spent at the installation location, keeping the site clean and minimising disruption to business operations.
Ergonomic Health, Safety and Compliance
In commercial spaces, the safety of occupants is paramount. This hardware is designed to ensure that doors remain closed and locked when not in use, which is a critical requirement for fire safety and building security. By managing the closing force so precisely, the unit reduces the risk of injury caused by heavy, unmanaged, or slamming doors.
Furthermore, the physical requirements for operating these doors are kept within manageable limits. This ensures that elderly users or individuals with limited physical strength can open the door without excessive strain. Reducing the force needed to move the door while maintaining a reliable closing speed is a key aspect of creating an inclusive and accessible environment for everyone.
Compliance with international standards is built into the design process. Tested to EN 1154 and certified to ISO 9001 standards, this hardware meets the rigorous quality management and functional testing required for modern construction projects. When you choose this product, you are investing in a certified solution that meets the expectations of building inspectors and fire safety officers alike.
Commercial ROI and Long Term Value
Investing in high-quality ironmongery is one of the most effective ways to lower the long-term operational costs of a facility. Cheap, low-grade closers often fail within the first year, leading to leaking hydraulic fluid, sagging doors, or latch failures that require emergency repairs. By selecting this durable model, you are extending the lifecycle of your entrance doors and reducing the frequency of maintenance visits.
Expert Advice on Selection
Not sure if this Transom Door Closer is right for your requirements? If you are not sure if this transom door closer is right for your requirements please contact our friendly team today to discuss your requirements.
The business case for this choice is clear. The reduction in repair overheads, combined with the protection of your physical assets from damage caused by uncontrolled door movement, creates an immediate return on investment. Furthermore, the aesthetic appeal of a concealed closer adds value to the property, enhancing the professional image of the building entrance for clients and visitors.
Technical Specifications
To ensure this model is compatible with your specific frame configuration, please review the following technical data. This unit is designed for versatility and precision.
| Feature | Specification |
|---|---|
| Closing Force | EN4 |
| Maximum Door Width | 1100mm |
| Maximum Door Weight | 110kg |
| Maximum Opening Angle | 130 Degrees |
| Transom Length | 323mm |
| Transom Width | 90mm |
| Transom Height | 38mm |
| Hold Open Status | Non hold open |
| Adjustments | 2 separate valves for speed and latching |
| Standards Compliance | EN 1154 and ISO 9001 |
The flexibility of this system allows it to be used with a variety of single and double action doors. Please note that side load and end load fittings are sold separately to ensure you have the correct components for your specific frame style. By selecting the appropriate fittings, you can a perfect fit and long-term reliability for your installation.
Whether you are fitting out a new retail space, an office lobby, or a public building, this hardware provides the performance required to maintain order and security. Its reputation in the industry is built upon years of consistent, reliable service in demanding environments. Upgrade your entrance today with a solution that combines engineering excellence with a hidden, minimalist design profile.
Specification
| Manufacturer | Dorma |
|---|---|
| Guarantee | 2 Year |
| Type | Transom |
| Power sizes | 4 |
| Finish | N/A |
| CE Certified | No |
| Certifire Approved | No |
| Application | Universal |
| Arm Assembly | N/A |
| Closing Speed | Variable |
| Latching Action | Yes |
| Stand Open | No |
| Back Check | Yes |
| Delayed Action | No |
