FM51 | Respiratory Protection | CBRN Protection | Full Face Mask

  • FM51 Header

FM51 – The in-vehicle respiratory system

The FM51 is a variation of the latest generation Avon FM50 mask but designed specifically for combat vehicle operators by enabling vehicle respiratory and communications system integration.

Supported with a CVC hood for head and neck protection and a communications lead and hose to integrate with the vehicle’s blower and COLPRO systems, the FM51 provides the same outstanding protection from battlefield concentrations of CB agents, toxic industrial materials, chemicals and particulates.

The FM51 offers vehicle operators clear communications while wearing a mask; and an integrated Electronic Communications Port allows for direct connection to the vehicle’s radio system though low profile communications lead.

Twin filters reduce breathing resistance and Avon’s advanced hose assembly provides direct interface with the vehicle’s air supply with a quick release connection for rapid exit.

FM51 product
fm51 brochure

For further information
please download the FM51 brochure


fm51 features1

Field of View

  • Panoramic single lens visor
  • Optically correct visor
  • Scratch Resistant
fm51 features2


  • Chlorobutyl rubber silicone blend mask
  • 3 face piece sizes for improved fit
  • High flow fail safe drinking device
fm51 features3


  • Front mounted exhale valve allows clear direct communication
  • Electronic Communication Port (ECP) for optional voice projection
  • Radio communications available through ECP
fm51 features4

Air Management

  • Low inhalation resistance & excellent de-mist properties
  • Low-re-breathed carbon dioxide
  • Hose assembly provides rapid interface to vehicle air supply 
FM51 Mask Specifications
CBRN Agent Resistance FM51 Performance
Mustard (H)
Sarin (GB)
Soman (GD)
Greater than 36 hrs
Laboratory Protection
Factory Performance
(Sodium Chloride)

Greater than 10,000
FM51 mask (including twin filters) 860g (1.9 lbs)
FM51 mask (including twin filters, vehicle hose, protective hood, and comms lead) 1270g (2.8 lbs)
Breathing Performance
Re-breathed CO2 0.8%
Inhalation Resistance at:
(with FM61 filters fitted)
30 L/Min
95 L/Min
160 L/Min
Mask Only:

2 mm WG
8 mm WG
12 mm WG
Mask & Filters:

10 mm WG
30 mm WG
64 mm WG
Exhalation Resistance at:
85 L/Min
160 L/Min

7mm WG
12 mm WG
Field of View
Visual Field Score - NIOSH CBRN APR Standard 96
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  • FM61

    Low profile conformal filter with bayonet quick fit for use only with the FM50 Mask. General purpose military CBRN performance.

  • Laser Outsert

    Specialist accessory for the removal of harmful laser wavelengths commonly produced by laser sighted weapons. Constructed from flexible polycarbonate providing additional impact and scratch resistance.

  • Mirrored Outsert

    Provides protection from UV light and improves contrast and depth perception. It also hides the wearer’s eyes while reflecting the surroundings to provide psychological advantages in threat situations.

  • Sunlight Outsert

    Additional protection against high level UV light and flash flares. Constructed from flexible polycarbonate providing additional impact and scratch resistance.

  • Vision Correction Assembly

    Enables prescription lenses to be fitted to the 50 Series masks ranging from -8 to +10 Diopters in power. Flexible design allows assembly to fold inside the mask.

  • Voice Projection Unit (VPU)

    For enhanced communication, an optional Voice Projection Unit (VPU) with internal microphone is easily connected via the Electronic Communication Port (ECP).