M-series M51
Weighted sound reduction index Rw = 51 dB
Suitable for indoor and outdoor applications
Available from 40 working days
The M-series M51 is a high-performance steel door that combines advanced sound insulation with fire protection for demanding industrial and technical environments. The door is designed for applications where both acoustic performance and safety are essential. It is available as a single or double leaf and can be manufactured to open left- or right-handed, allowing it to integrate easily into a wide range of installations.
The door features a durable double-skin construction with galvanised steel sheets and provides a weighted sound reduction of Rw = 51 dB, effectively limiting sound transmission. With a standard door leaf thickness of 75 mm and a mass of approximately 49 kg/m², the M51 offers a solid and durable closure.
The M51 can be supplied with different fire resistance classifications in accordance with EN 1634-1 / NEN 6069, allowing flexible integration into projects requiring both acoustic performance and fire protection. The door can also be finished in any RAL colour, ensuring both technical performance and architectural consistency across all applications.
The features above can be combined and tailored to your project. For more custom possibilities, or guidance in selecting the right door, our specialists are happy to help you find the best solution for your application.
M-series doors are suitable for integration in standard building façades, as well as in technical housings and industrial enclosures. They are commonly used in transformer and electrical rooms, mechanical spaces, data centres, laboratories and other facilities where safety, durability and performance are essential.
Downloads and specifications
Answers to common questions
Merford doors can be made airtight and thermally insulated, contributing to energy savings in buildings and supporting sustainability targets.
Yes, we provide comprehensive service and maintenance for all our doors. Our specialists carry out periodic inspections, check mechanical and electronic components, and ensure the doors maintain their original performance in terms of sound insulation, fire resistance, and security. This guarantees long-term reliability and optimal operation, even in demanding environments. Service can be provided on a contract basis or as a one-time request.
Yes, our doors are available in custom widths, heights, leaf configurations, and finishes, suitable for both new builds and renovations.
Our M-series doors can combine sound insulation, fire resistance, smoke control, burglary, or bullet resistance in a single door. Depending on the project, ventilation, ATEX safety, transformer protection, or anti-panic functionality can also be added, though not all features can always be combined simultaneously.
