DUON™ intelligent head protection

The ultimate helmet for work at height and confined spaces

DUON technical safety, unvented helmet allows wearers to be fully compliant in complex environments containing different, changing hazards.

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First and only helmet that fully conforms to European Standard requirements for industrial and climbing situations. Comfortable helmet for work at height and rescue. 

DUON™ unvented helmet is a high specification confined space helmet suitable for work at height, with dual certification meeting both industrial standards.

It is the first and only safety helmet meeting all of the technical requirements for working at height and confined areas.

DUON helmets have a unique chinstrap buckle which can be switched between ‘strong’ and ‘weak’ to give conformity with either standard, allowing wearers to be fully compliant in complex environments containing different, changing hazards.

DUON unvented height safety helmet complies with European standards, EN 397, having a special chin strap buckle (see below) with a variable fastening power. It also conforms to MM 440 V a.c.

The DUON-Air vented version has additional vents that can be switched to give conformity with either standard. All switching is carried out without tools.

The DUON is suitable as a confined space helmet – a versatile safety helmet for every industry.

Industrial safety helmets are designed to protect not only the upper part of a wearer’s head but also to provide lateral protection.

Advanced cradle design enables optimum comfort and sized to fit between 52cm to 66cm.

DUON Updates:

Improved headband height adjustment – can be easily adjusted with the push fit stud, no tools required.

The DUON has undergone further testing to extend its lifespan, following accelerated UV exposure test we have increased the maximum lifespan of the helmet to 10 years use. Previously this was limited to 5 years use and 5 years storage (a total of 10 years).


MH01 – DUON™ standard – unvented EN 397
MH02 – DUON Air™ – vented, – EN 397 & EN 12492

Unvented helmet standard colours are White, Green and Orange. Other colours may be available subject to quantity required, please contact us for details.


  • ‘T-slot’ side fittings for standard ear defenders etc.
  • Clips for elastic strap mounted lights, cameras etc.
  • Brackets front and rear for popular cap lamps and other accessories.


  • Main adjustment to small/medium/large helps keep the helmet centred on the head.
  • Fine adjustment by ratchet wheel, can be operated with one hand even whilst being worn.
  • Headband height adjustment allows user to maintain field of view.
  • 6 point head cradle for stability.


  • EN397 (‘industrial’) has a weak chinstrap to prevent injury if the helmet becomes trapped in machinery etc. and small vents to prevent items such as sparks hitting the wearer.
  • EN12492 (‘mountaineering’) has a strong chinstrap so the helmet stays in place in a fall – protecting the head, and large vents to help prevent workers getting too hot – an occupational health improvement.

Accessories can be retro fitted:

Patented GB 2 531 146.

DUON Helmet Orange rear detail


  • Instant configuration
  • Variable ventilation system
  • Controllable buckle release force
  • Seven points of adjustment
  • Contoured for unhindered upward vision
  • Compatible with range of accessories
  • Full range of colours & bespoke sticker options
  • Replacement sweat bands and pads
  • Dual certification


Sizing: 52cm to 66cm circumference
Material: ABS, Nylon and Polyester
Weight: 0.45 kg
Conformity: EN397 MM 440 V a.c.