M51 | Full Face Respirator | CBRN Protection | Air Purifying Respirator

The M51 is a variation of the latest generation Avon M50 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.

Features & Benefits

Field of View

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


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


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

Air Management

  • Low inhalation resistance & excellent de-mist properties
  • Low-re-breathed carbon dioxide
  • Hose assembly provides rapid interface to vehicle air supply 

Technical Specs

CBRN Agent Resistance M51 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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