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M-series MB steel door installed in a concrete enclosure at an industrial port facility.
M-series custom doors

M-series M41

Steel door with customisable features, functions, sizes and accessories.

Available with or without sound insulation (Rw = 41 dB)

Suitable for indoor and outdoor applications

Available from 40 working days

We're ready to help – available on weekdays from 09:00 to 17:00.
Description

The M-series M41 is a versatile steel door that provides a robust and reliable solution for industrial and commercial applications. As the base model within the M-series, it combines robust construction with extensive configuration options. The door is available as a single or double leaf and can be manufactured to open left- or right-handed, making it suitable for almost any installation.

The door features a durable double-skin construction with galvanised steel sheets, ensuring long-lasting performance and high resistance to intensive use. With a door leaf thickness of 75 mm and a weight of approximately 25 kg/m², the M41 provides a stable and robust closure.

For applications requiring additional acoustic performance, the door can be equipped with an optional sound insulation package. Thanks to its flexible design, the M-series M41 offers an excellent foundation for customised configurations and can be finished in any RAL colour, ensuring functionality and aesthetics are perfectly matched to the project.

Core features
Fundamental properties that define performance.
CE certification
EN 14351-1.
Sound insulation
Available with or without sound insulation (Rw = 41 dB).
Fire resistance
Smoke control
Burglary resistance
Optional RC2, RC3 or RC4 classification (EN 1627 / NEN 5096).
Bullet resistance
Optional FB4 protection (EN 1522-1).
Air and gas tightness
Additional functions
Additional functions that enhance safety and control.
Anti-panic function
Optional panic (EN 1125) or emergency (EN 179) hardware.
Access control
Optional access control systems, including key, card, code, biometric and electronic options.
Specialised options
Solutions for highly specific technical environments.
Ventilation
Available with integrated ventilation solutions.
ATEX model
Available as ATEX-compliant version.
Transformer model
Available as transformer configuration.
Properties

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.

Applications

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

For complete technical specifications, manuals and certificates, refer to the documents below.
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Answers to common questions

Answers to the most common technical and practical questions.
Are Merford doors energy efficient?

Merford doors can be made airtight and thermally insulated, contributing to energy savings in buildings and supporting sustainability targets.

Does Merford provide service and maintenance for doors?

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.

Are M-series doors suitable for custom designs and special dimensions?

Yes, our doors are available in custom widths, heights, leaf configurations, and finishes, suitable for both new builds and renovations.

Which performance features can I combine in a single door?

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.