Air flow treatment system and method for ventilation systems

A method for sterilizing a flow of air in a ventilation system, comprising:

• providing a flow of a carrier gas;
• humidifying said flow of said carrier gas;
• plasmatizing said humidified carrier gas with electrical energy from a RF generator in a mixer having an interior chamber, an active electrode inside said interior chamber and connected to an electrical output of said plasma generator, an outer electrode connected to a ground and a dielectric barrier between said inner electrode and said outer electrode, wherein said mixer has a first fluid input port connected to said source of a carrier gas, a second fluid input connected to said ventilation system at a first point and a fluid output connected to said ventilation system at a second point;
• supplying a feed gas from said second fluid input into said mixer;
• mixing said feed gas with said plasmatized carrier gas in said mixer;
• and
• supplying said mixed feed gas and plasmatized carrier gas to said ventilation system through said fluid output.