Techical Overview 

• The AVM was developed over a 7 year period following the 2002/3 SARS outbreak, specifically to filter virus particles (virions) in the range 60nm to 180nm without the increase in work of breathing associated with conventional ultra-fine filtration.
• Designed and engineering in Scotland, the technology then lay idle until the 2019 COVID pandemic, and is now being retooled for manufacture in the UK.
• The AVM is the first mask to provide efficient filtration of virions. It achieves this with a four layer filter, fitted as a replacement module in a mask shell comprising a nylon outer shell and a soft silicone inner.
• Soft silicone oro-nasal with wide elasticated straps minimise pressure on the face, while allowing the mask to be cleaned and sterilised.
• The 30V – 36V electrostatic charge is generated by a circuit board within the mask, powered by an external AA cell to keep the mask light and comfortable. The circuit board is available with a microphone and signal conditioning circuit, for use with an optional speaker module: this removes distortion form the voice, avoiding muffling the wearer's speech.
• The straps and other fittings are non-allergenic and are designed to minimise the pressure on the skin of the wearer, and avoid fungal and bacterial growth.
• Sterilisation is by immersion in DuPont Virkon solution.

Core Technology 

• Surgical mask grade filtration outer layer (as standard N95 masks) 
• Outer shell allows gas to travel over the whole surface of the filter, which is folded for the maximum surface area. 
• Nano-Ag coated FFP3 electrostatic pre-charge layer, which charges the virions to 30 million volts per meter by bringing them within a micron of a 30V +ve source, safe for handling and use. Insulating filter layer, large pores to avoid clogging
• A 7mm thick Nano molecular sieve at -ve potential. The positively charged virions are attracted onto the surface of the negatively charged sieve, for them to be trapped in the molecular cages which are up to 60nm -230nm in diameter. 
• 3nm thick finely dispersed silver coating (Nano-Ag) on the sieve causes the virion to be destroyed after a short period of contact.
• The outer shell and soft silicone oro-nasal provide full shift comfort, even with multi-day use. 
• Snap connections and to the electrostatic generator allow the filter pads to be replaced quickly and easily at the start of each shift.
• Power is supplied by AA battery pack worn remotely, life in constant use is 7 days